Home » Public Forums » GMCnet » [GMCnet] Synthetics are great. But I don't see them in our old dirty engines
| [GMCnet] Synthetics are great. But I don't see them in our old dirty engines [message #342910] |
Sun, 28 April 2019 11:52  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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I think nowadays, most manufactures recommend synthetics for the engine that are produced today. Yes. Both the old/new engines have pistons that go up, and down. And a crankshaft that goes round, and round. But after that. It's a different world. Look how small the oil filters are. And how long the oil change cycles are. These new engine run extremely clean inside the crankcase. As to oil contamination.
Our engine are of a different design. That produce much more of these damaging crankcase oil contaminants. You help to negate some of what these contaminants do to you engine. Simply by removing them by more frequent oil/filter changes. Using synthetics simply doesn't change this situation. I put the Howell/GM EFI system on our 403. I've noticed that my oil stays cleaner, longer. But even after adding the EFI. I haven't lengthened my oil change intervals. YES. I'm a NUT on oil changes. But I seem to get some benefits. As an example. I have a 98 Chevy Astro that was used for one of our businesses. Then our daughter used it for some year. Now I'm back to using it. I like it. The interior/seats still look great. Oil/filter changes have always been in the 3000 mile range. The odometer is now at 324,000 miles. Hot oil PSI are at 50. Never add oil between oil changes. That 4.3 Chevy V6 has never been apart for anything. Always had the same old 10W-30 used in it. Planning on a trip to Kansas/Oklahoma from Iowa in the next few weeks with it. As to synthetic oils. Use them. Just don't go over 3000 miles on an oil change. Bob Dunahugh 78 Royale
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| Re: [GMCnet] Synthetics are great. But I don't see them in our old dirty engines [message #342919 is a reply to message #342910] |
Sun, 28 April 2019 17:33  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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BobDunahugh wrote on Sun, 28 April 2019 12:52 I think nowadays, most manufactures recommend synthetics for the engine that are produced today. Yes. Both the old/new engines have pistons that go up, and down. And a crankshaft that goes round, and round. But after that. It's a different world. Look how small the oil filters are. And how long the oil change cycles are. These new engine run extremely clean inside the crankcase. As to oil contamination.
Our engine are of a different design. That produce much more of these damaging crankcase oil contaminants. You help to negate some of what these contaminants do to you engine. Simply by removing them by more frequent oil/filter changes. Using synthetics simply doesn't change this situation. I put the Howell/GM EFI system on our 403. I've noticed that my oil stays cleaner, longer. But even after adding the EFI. I haven't lengthened my oil change intervals. YES. I'm a NUT on oil changes. But I seem to get some benefits. As an example. I have a 98 Chevy Astro that was used for one of our businesses. Then our daughter used it for some year. Now I'm back to using it. I like it. The interior/seats still look great. Oil/filter changes have always been in the 3000 mile range. The odometer is now at 324,000 miles. Hot oil PSI are at 50. Never add oil between oil changes. That 4.3 Chevy V6 has never been apart for anything. Always had the same old 10W-30 used in it. Planning on a trip to Kansas/Oklahoma from Iowa in the next few weeks with it. As to synthetic oils. Use them. Just don't go over 3000 miles on an oil change. Bob Dunahugh 78 Royale
Bob,
There is no disadvantage to your level of paranoia.
There are real advantages to the synthetics that absolutely should not apply to our application.
- They resist degradation from the acids of combustion by-products.
- They resist oxidation breakdown for much longer than dino oils. (Still limits at about a years service.)
- They do not cease to be a lubricant when exposed to temperatures in excess of 305°F.
Before my engine developed an internal coolant leak and we were working on an 12K mile season I did extend the oil change to about 9K with regular reports from Brookstone.
When Chaumière gets back on the road, I am hoping to try it again. Is this a cost issue? Buy not changing out the lube oil I can save 28$us on a 3K mile run (that is 23 for the oil and a filter from Rock Auto).
Could I probably do this with a good dino oil? Sure!!!
The savings between buying M1-15w50 in a jug at Walmart and any good dino oil I can get would probably save me as much as 8$us per lube oil service.
This is just noise when you compare it to the ~3K$us I put into the engine last year.
I also buy 10$ a tube synthetic grease. Oil and grease are always cheaper than parts. (Too bad grease would not have saved a lower control arm.)
So, if you are running your coach 3~5K miles a year and the engine is a long way from its last overhaul, save the money for beer or some other worthwhile expense.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Synthetics are great. But I don't see them in our old dirty engines [message #342934 is a reply to message #342910] |
Mon, 29 April 2019 07:32 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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I do oil changes based on pounds of fuel burned and hours of operation, with time since last drain as a final factor. If let's say a Toronado in good tune at 55 MPH could get 20 MPG, compare that to our 10 MPG. So just for easy math the GMC has twice the fuel rate. 3000 interval is the equivalent of 6000 miles of combustion byproducts to keep in suspension. If you do lots of city driving then the engine is running but not moving the odometer much of the time, so mileage not always a very accurate indicator. I shoot for 2000 mile drain intervals so if I am late it is ok. This shortened interval keeps the engine cleaner so next oil change stays cleaner (to the eye) longer. Also that way on a long trip I feel I can stretch to 4000 before getting home to drain. On my XJ Jeep overhead display I find around 80 hours is the 3000 mile mark. So I would shoot to not exceed 100 Hrs. We are at best in the severe service interval chart, but after sandy, dust storm or other extreme conditions I would do a service ASAP. For the record been using only T6 5W-40 since Cinnabar 455 installed. No issues to date in about 10 years.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] Synthetics are great. But I don't see them in our old dirty engines [message #342951 is a reply to message #342910] |
Mon, 29 April 2019 13:40 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Along these lines, a college classmate - early 60s - had a chevy 2 with a partial flow oil filter. Was an accessory. It used a roll of john wayne toilet paper as the element, and his oil stayed surprisingly clean in Ballimer winter city driving. I always wondered why it did so much better than a spin on filter.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Synthetics are great. But I don't see them in our old dirty engines [message #342958 is a reply to message #342951] |
Mon, 29 April 2019 16:40 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
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When I was a farm boy back in 68 There was a tractor that had 2 3 roll
filters plummed so all the oil went through one of the 6 toilet paper
filters. It seemed to work well as long as you kept the filters changed. I
was told the main problem was that oil would cut a channel through the
paper and not filter as well after that.
On Mon, Apr 29, 2019 at 11:42 AM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Along these lines, a college classmate - early 60s - had a chevy 2 with a
> partial flow oil filter. Was an accessory. It used a roll of john wayne
> toilet paper as the element, and his oil stayed surprisingly clean in
> Ballimer winter city driving. I always wondered why it did so much better
> than
> a spin on filter.
>
>
> --johnny
> --
> Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
> Braselton, Ga.
> I forgive them all, save those who hurt the dogs. They must answer to me
> in hell
>
>
> _______________________________________________
> GMCnet mailing list
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*John Phillips*
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John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Synthetics are great. But I don't see them in our old dirty engines [message #342959 is a reply to message #342910] |
Mon, 29 April 2019 16:47 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
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Senior Member |
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I remember those filters and had one on a vehicle I bought. It was a Franz brand, there may have been others. It did do a wonderful job keeping the oil clean but there was a pretty good pressure drop across it.
Mind you that was with a stock oil pump and a fair ammount of mileage
It certainly did a better job removing carbon and particles, but i doubt it removed enough chemical contaminants to justify the change intervals Franz claimed. I wonder if anyone did any actual oil analysis on it.As to why Id say it was like a multiple pass effect, as the element was longer and effectivly thicker
I also tried an Oberg filter which was basicly an inline low micron mesh inline to a cooler. You could take it apart to clean it and see what it was picking up. At one time it was popular in racing to cut apart filters to look at that but it was a huge messy PITA.
TBH, I think regular oil filtration would do a better job. Maybe add one in advance of a remote filter if you wanted to track particles.
76 Glenbrook
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| Re: [GMCnet] Synthetics are great. But I don't see them in our old dirty engines [message #342960 is a reply to message #342959] |
Mon, 29 April 2019 17:30 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
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The good part was the filter elements were cheap and in the case of the 6
roll installation, there were about 200 sq inches and 1 inch thick of
filter. That much filter could trap a lot of carbon but there was nothing
to do about chemistry. They did hold a lot more oil.
John Phillips
75 Avion VIN A26000
Retired
Rancho Cordova, CA 95670
On Mon, Apr 29, 2019 at 3:03 PM Chris Tyler via Gmclist <
gmclist@list.gmcnet.org> wrote:
> I remember those filters and had one on a vehicle I bought. It was a Franz
> brand, there may have been others. It did do a wonderful job keeping the
> oil clean but there was a pretty good pressure drop across it.
> Mind you that was with a stock oil pump and a fair ammount of mileage
>
> It certainly did a better job removing carbon and particles, but i doubt
> it removed enough chemical contaminants to justify the change intervals
> Franz
> claimed. I wonder if anyone did any actual oil analysis on it.As to why Id
> say it was like a multiple pass effect, as the element was longer and
> effectivly thicker
>
> I also tried an Oberg filter which was basicly an inline low micron mesh
> inline to a cooler. You could take it apart to clean it and see what it was
> picking up. At one time it was popular in racing to cut apart filters to
> look at that but it was a huge messy PITA.
> TBH, I think regular oil filtration would do a better job. Maybe add one
> in advance of a remote filter if you wanted to track particles.
> --
> 76 Glenbrook
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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*John Phillips*
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John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| [GMCnet] Change your engine oil filter as GM suggested. No matter the oil you use. [message #342967 is a reply to message #342932] |
Tue, 30 April 2019 10:03 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Back when I was in collage. Myself, and others put together a Masters study on oil filters. And at the length of service. And at what point that the oil filter bypass would be opened. We drilled a lot of holes in engine blocks for gauges. Part of the study used cars from all of the big 3 back then. I was alittle surprised how all 3 brands were so similar in bypass opening. The filter medias in general. Where getting restricted to the point that bypass's valves. Started at about 2400 miles. All engine where equipped with PCV's installed. This is an extremely short, and general e-mail of a very long review of the paper. Bob Dunahugh 78 Royale
________________________________
From: Bob Dunahugh
Sent: Monday, April 29, 2019 5:09 AM
To: gmclist@list.gmcnet.org
Subject: RE: Synthetics are great. But I don't see them in our old dirty engines
Matt. How often do you change your oil filter? Bob D
________________________________
From: Bob Dunahugh
Sent: Sunday, April 28, 2019 11:52 AM
To: gmclist@list.gmcnet.org
Subject: Synthetics are great. But I don't see them in our old dirty engines
I think nowadays, most manufactures recommend synthetics for the engine that are produced today. Yes. Both the old/new engines have pistons that go up, and down. And a crankshaft that goes round, and round. But after that. It's a different world. Look how small the oil filters are. And how long the oil change cycles are. These new engine run extremely clean inside the crankcase. As to oil contamination.
Our engine are of a different design. That produce much more of these damaging crankcase oil contaminants. You help to negate some of what these contaminants do to you engine. Simply by removing them by more frequent oil/filter changes. Using synthetics simply doesn't change this situation. I put the Howell/GM EFI system on our 403. I've noticed that my oil stays cleaner, longer. But even after adding the EFI. I haven't lengthened my oil change intervals. YES. I'm a NUT on oil changes. But I seem to get some benefits. As an example. I have a 98 Chevy Astro that was used for one of our businesses. Then our daughter used it for some year. Now I'm back to using it. I like it. The interior/seats still look great. Oil/filter changes have always been in the 3000 mile range. The odometer is now at 324,000 miles. Hot oil PSI are at 50. Never add oil between oil changes. That 4.3 Chevy V6 has never been apart for anything. Always had the same old 10W-30 used in it. Planning on a trip to Kansas/Oklahoma from Iowa in the next few weeks with it. As to synthetic oils. Use them. Just don't go over 3000 miles on an oil change. Bob Dunahugh 78 Royale
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| Re: [GMCnet] Change your engine oil filter as GM suggested. No matter the oil you use. [message #342968 is a reply to message #342967] |
Tue, 30 April 2019 10:42 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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I’ve been following this thread with great interest, and just need to pass on my observations made at the local engine shop that I advise.
When they get backed up, I stop looking at the books, and become the tear down guy. One of the engine builders family has about the best bakery in the area, so the glazed donuts are superb, and the coffee is hot, and conversation is always spirited.
What I’ve observed is pretty straightforward. Engines fed a steady diet of synthetic oil and regular filter changes are much cleaner internally than those using conventional lubricants.
It’s a remarkable difference to my eye.
Further, the engines running synthetics generally run longer (hours or miles, pick your measure, same difference).
I know much of this is consistent with Dick Patterson’s findings.
But because of what I’ve learned here, and just kicking around vehicles, I use synthetic lubricants, unless there is compelling manufacturers guidance to the contrary.
So, I change my oil… and the filter too. Maybe a teeny bit more often when Walmart has cheap Mobil 1
My .02
Dolph
DE AD0LF
Wheeling, West Virginia
1977 26’ ex-PalmBeach
Howell EFI & EBL, Reaction Arms, Manny Transmission
“The Aluminum and Fiberglass Mistress"
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| Re: [GMCnet] Change your engine oil filter as GM suggested. No matter the oil you use. [message #342969 is a reply to message #342968] |
Tue, 30 April 2019 10:52 |
Mike Kelley
Messages: 467
Registered: February 2017
Karma: -2
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Senior Member |
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Thanks Adolph:
That is exactly what I needed to know to switch to Mobil 1.
Mike/The Corvair a holic
Sent from my iPhone
> On Apr 30, 2019, at 10:42 AM, Dolph Santorine via Gmclist wrote:
>
> I’ve been following this thread with great interest, and just need to pass on my observations made at the local engine shop that I advise.
>
> When they get backed up, I stop looking at the books, and become the tear down guy. One of the engine builders family has about the best bakery in the area, so the glazed donuts are superb, and the coffee is hot, and conversation is always spirited.
>
> What I’ve observed is pretty straightforward. Engines fed a steady diet of synthetic oil and regular filter changes are much cleaner internally than those using conventional lubricants.
>
> It’s a remarkable difference to my eye.
>
> Further, the engines running synthetics generally run longer (hours or miles, pick your measure, same difference).
>
> I know much of this is consistent with Dick Patterson’s findings.
>
> But because of what I’ve learned here, and just kicking around vehicles, I use synthetic lubricants, unless there is compelling manufacturers guidance to the contrary.
>
> So, I change my oil… and the filter too. Maybe a teeny bit more often when Walmart has cheap Mobil 1
>
> My .02
>
>
> Dolph
>
> DE AD0LF
>
> Wheeling, West Virginia
>
> 1977 26’ ex-PalmBeach
> Howell EFI & EBL, Reaction Arms, Manny Transmission
>
> “The Aluminum and Fiberglass Mistress"
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Change your engine oil filter as GM suggested. No matter the oil you use. [message #342971 is a reply to message #342969] |
Tue, 30 April 2019 12:18 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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I have been told that Mobil 1 leaks more because the gaskets do not swell
as much as with Mobil 1. Is there any truth to that statement?
On Tue, Apr 30, 2019 at 9:59 AM Mike Kelley via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Thanks Adolph:
> That is exactly what I needed to know to switch to Mobil 1.
> Mike/The Corvair a holic
>
> Sent from my iPhone
>
>> On Apr 30, 2019, at 10:42 AM, Dolph Santorine via Gmclist gmclist@list.gmcnet.org> wrote:
>>
>> I’ve been following this thread with great interest, and just need to
> pass on my observations made at the local engine shop that I advise.
>>
>> When they get backed up, I stop looking at the books, and become the
> tear down guy. One of the engine builders family has about the best bakery
> in the area, so the glazed donuts are superb, and the coffee is hot, and
> conversation is always spirited.
>>
>> What I’ve observed is pretty straightforward. Engines fed a steady diet
> of synthetic oil and regular filter changes are much cleaner internally
> than those using conventional lubricants.
>>
>> It’s a remarkable difference to my eye.
>>
>> Further, the engines running synthetics generally run longer (hours or
> miles, pick your measure, same difference).
>>
>> I know much of this is consistent with Dick Patterson’s findings.
>>
>> But because of what I’ve learned here, and just kicking around vehicles,
> I use synthetic lubricants, unless there is compelling manufacturers
> guidance to the contrary.
>>
>> So, I change my oil… and the filter too. Maybe a teeny bit more often
> when Walmart has cheap Mobil 1
>>
>> My .02
>>
>>
>> Dolph
>>
>> DE AD0LF
>>
>> Wheeling, West Virginia
>>
>> 1977 26’ ex-PalmBeach
>> Howell EFI & EBL, Reaction Arms, Manny Transmission
>>
>> “The Aluminum and Fiberglass Mistress"
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> _______________________________________________
> GMCnet mailing list
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*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Change your engine oil filter as GM suggested. No matter the oil you use. [message #342972 is a reply to message #342971] |
Tue, 30 April 2019 12:17 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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Senior Member |
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That’s consistent with my experience.
I don’t know the cause.
Dolph
DE AD0LF
Wheeling, West Virginia
1977 26’ ex-PalmBeach
Howell EFI & EBL, Reaction Arms, Manny Transmission
“The Aluminum and Fiberglass Mistress"
> On Apr 30, 2019, at 1:18 PM, John Phillips via Gmclist wrote:
>
> I have been told that Mobil 1 leaks more because the gaskets do not swell
> as much as with Mobil 1. Is there any truth to that statement?
>
> On Tue, Apr 30, 2019 at 9:59 AM Mike Kelley via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> Thanks Adolph:
>> That is exactly what I needed to know to switch to Mobil 1.
>> Mike/The Corvair a holic
>>
>> Sent from my iPhone
>>
>>> On Apr 30, 2019, at 10:42 AM, Dolph Santorine via Gmclist > gmclist@list.gmcnet.org> wrote:
>>>
>>> I’ve been following this thread with great interest, and just need to
>> pass on my observations made at the local engine shop that I advise.
>>>
>>> When they get backed up, I stop looking at the books, and become the
>> tear down guy. One of the engine builders family has about the best bakery
>> in the area, so the glazed donuts are superb, and the coffee is hot, and
>> conversation is always spirited.
>>>
>>> What I’ve observed is pretty straightforward. Engines fed a steady diet
>> of synthetic oil and regular filter changes are much cleaner internally
>> than those using conventional lubricants.
>>>
>>> It’s a remarkable difference to my eye.
>>>
>>> Further, the engines running synthetics generally run longer (hours or
>> miles, pick your measure, same difference).
>>>
>>> I know much of this is consistent with Dick Patterson’s findings.
>>>
>>> But because of what I’ve learned here, and just kicking around vehicles,
>> I use synthetic lubricants, unless there is compelling manufacturers
>> guidance to the contrary.
>>>
>>> So, I change my oil… and the filter too. Maybe a teeny bit more often
>> when Walmart has cheap Mobil 1
>>>
>>> My .02
>>>
>>>
>>> Dolph
>>>
>>> DE AD0LF
>>>
>>> Wheeling, West Virginia
>>>
>>> 1977 26’ ex-PalmBeach
>>> Howell EFI & EBL, Reaction Arms, Manny Transmission
>>>
>>> “The Aluminum and Fiberglass Mistress"
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>
>
> --
>
> *John Phillips*
> _______________________________________________
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| Re: [GMCnet] Change your engine oil filter as GM suggested. No matter the oil you use. [message #342981 is a reply to message #342972] |
Tue, 30 April 2019 13:22 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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All about viscosity and molecules. Synthetics have modified ones, they are
a different chain length than dinosaur bones. More "slippery" too.
Jim Hupy
Salem, Or
78 GMC ROYALE 403 (With organic Valvoline 20-50.) I'm with Bob D. Change it
every 3500 - 4000 miles. Filter too.
On Tue, Apr 30, 2019, 10:18 AM Dolph Santorine via Gmclist <
gmclist@list.gmcnet.org> wrote:
> That’s consistent with my experience.
>
> I don’t know the cause.
>
>
> Dolph
>
> DE AD0LF
>
> Wheeling, West Virginia
>
> 1977 26’ ex-PalmBeach
> Howell EFI & EBL, Reaction Arms, Manny Transmission
>
> “The Aluminum and Fiberglass Mistress"
>
>> On Apr 30, 2019, at 1:18 PM, John Phillips via Gmclist gmclist@list.gmcnet.org> wrote:
>>
>> I have been told that Mobil 1 leaks more because the gaskets do not swell
>> as much as with Mobil 1. Is there any truth to that statement?
>>
>> On Tue, Apr 30, 2019 at 9:59 AM Mike Kelley via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> Thanks Adolph:
>>> That is exactly what I needed to know to switch to Mobil 1.
>>> Mike/The Corvair a holic
>>>
>>> Sent from my iPhone
>>>
>>>> On Apr 30, 2019, at 10:42 AM, Dolph Santorine via Gmclist >> gmclist@list.gmcnet.org> wrote:
>>>>
>>>> I’ve been following this thread with great interest, and just need to
>>> pass on my observations made at the local engine shop that I advise.
>>>>
>>>> When they get backed up, I stop looking at the books, and become the
>>> tear down guy. One of the engine builders family has about the best
> bakery
>>> in the area, so the glazed donuts are superb, and the coffee is hot, and
>>> conversation is always spirited.
>>>>
>>>> What I’ve observed is pretty straightforward. Engines fed a steady diet
>>> of synthetic oil and regular filter changes are much cleaner internally
>>> than those using conventional lubricants.
>>>>
>>>> It’s a remarkable difference to my eye.
>>>>
>>>> Further, the engines running synthetics generally run longer (hours or
>>> miles, pick your measure, same difference).
>>>>
>>>> I know much of this is consistent with Dick Patterson’s findings.
>>>>
>>>> But because of what I’ve learned here, and just kicking around
> vehicles,
>>> I use synthetic lubricants, unless there is compelling manufacturers
>>> guidance to the contrary.
>>>>
>>>> So, I change my oil… and the filter too. Maybe a teeny bit more often
>>> when Walmart has cheap Mobil 1
>>>>
>>>> My .02
>>>>
>>>>
>>>> Dolph
>>>>
>>>> DE AD0LF
>>>>
>>>> Wheeling, West Virginia
>>>>
>>>> 1977 26’ ex-PalmBeach
>>>> Howell EFI & EBL, Reaction Arms, Manny Transmission
>>>>
>>>> “The Aluminum and Fiberglass Mistress"
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>>
>>
>> --
>>
>> *John Phillips*
>> _______________________________________________
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>
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| Re: [GMCnet] Change your engine oil filter as GM suggested. No matter the oil you use. [message #342987 is a reply to message #342978] |
Tue, 30 April 2019 14:15 |
Dave Stragand
Messages: 307
Registered: October 2017
Karma: 0
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Senior Member |
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In the early days of synthetic oils, they did. It have the additives required for keeping older seals in good condition. That has long been remedied, but the belief that seals will shrink has persisted for some time since.
> On Apr 30, 2019, at 2:42 PM, Matt Colie via Gmclist wrote:
>
> johnd01 wrote on Tue, 30 April 2019 13:18
>> I have been told that Mobil 1 leaks more because the gaskets do not swell
>> as much as with Mobil 1. Is there any truth to that statement?
>> --
>> *John Phillips*
>
> John,
>
> I use Mobil 1 in more than just the coach, and I have not seen this.
> If you change an engine to a different oil formulation, leaks often start and I can explain why. It has to do with the differences in material
> absorption, but it gets complex from there.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
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1978 Transmode (403)
Pittsburgh, PA
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