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| [GMCnet] 20w 20 [message #152677] |
Mon, 12 December 2011 15:25  |
JP Winger
Messages: 86
Registered: September 2011
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Hi,
According to my GMC olds 455manual I should be using sae 20w20 engine oil but it doesn't seem to exist, what's the appropriate equivalent (for New York winter Avg 30 degrees).
Here are my notes from the manual....
Only SE engine oil, single grade oils best, multigrade ie. sae 10w-30 or 10w-40 ok
Sae 5w-20 oils not rec for sustained high speeds
Sae 5w-30 oils may b used if extreme low temp anticipated.
Sae 30 = 40-120 degrees, sae 20w20 = 10-80deg, sae10w = -10-60deg
Thanks,
JP
John-Paul Winger / US+1 310 9231126 / NZ+64 21 997919 / lavidalocations@gmail.com / Skype: lavidalocations
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| Re: [GMCnet] 20w 20 [message #152692 is a reply to message #152677] |
Mon, 12 December 2011 16:30  |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Your owners manual is 33 to 38 years old. Oils have changed
dramatically over those years. Ignore your manual totally on this
subject. As you found, some of the recoendef oil weights don't exist
now.
There are oils today that weren't even thought of back then.
I use Mobil 1 totally synthetic in a 15w50 weight. We travel to
relatively warm areas in the summer and live in a cold climate in the
winter. It hasbeen about 20 deg average here the last three weeks.
This grade will work for us throughout the year.
Of you are using mineral oil you could use 10w30 to 20w50 depending on
your weather (outside ambient temperature).
Emery Stora
Santa Fe, NM
On Dec 12, 2011, at 2:25 PM, JP Winger <lavidalocations@gmail.com>
wrote:
> Hi,
>
> According to my GMC olds 455manual I should be using sae 20w20
> engine oil but it doesn't seem to exist, what's the appropriate
> equivalent (for New York winter Avg 30 degrees).
>
> Here are my notes from the manual....
>
> Only SE engine oil, single grade oils best, multigrade ie. sae
> 10w-30 or 10w-40 ok
> Sae 5w-20 oils not rec for sustained high speeds
> Sae 5w-30 oils may b used if extreme low temp anticipated.
> Sae 30 = 40-120 degrees, sae 20w20 = 10-80deg, sae10w = -10-60deg
>
> Thanks,
> JP
>
> John-Paul Winger / US+1 310 9231126 / NZ+64 21 997919 / lavidalocations@gmail.com
> / Skype: lavidalocations
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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| Re: [GMCnet] 20w 20 [message #152695 is a reply to message #152677] |
Mon, 12 December 2011 16:44 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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JP,
I'm going to help you despite the fact that your bowlers THRASHED us yesterday in Hobart! ;-)
Oil formulations have advanced significantly since the GMC manual was published.
Go to Wal Mart and buy some Rotella T 15W- 40 and you're good to go.
You will receive recommendations that you put an additive called ZDDP in with it to prevent the tappets from wearing into the cam
shaft; however, there are two schools of thought on that.
One says you must add it, the second says it is critical only when breaking in a new engine.
I ran Double Trouble on Rotella T 15W - 40 for three summer tours (about 5000 miles each) and never added anything and so far so
good.
Regards,
Rob M.
-----Original Message-----
From: Of JP Winger
Hi,
According to my GMC olds 455manual I should be using sae 20w20 engine oil but it doesn't seem to exist, what's the appropriate
equivalent (for New York winter Avg 30 degrees).
Here are my notes from the manual....
Only SE engine oil, single grade oils best, multigrade ie. sae 10w-30 or 10w-40 ok
Sae 5w-20 oils not rec for sustained high speeds
Sae 5w-30 oils may b used if extreme low temp anticipated.
Sae 30 = 40-120 degrees, sae 20w20 = 10-80deg, sae10w = -10-60deg
Thanks,
JP
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] 20w 20 [message #152707 is a reply to message #152692] |
Mon, 12 December 2011 18:20 |
JP Winger
Messages: 86
Registered: September 2011
Karma: 0
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Member |
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Thanks.
Does it matter if it's mixed with the existing oil or do I need an oil change.
> Of you are using mineral oil you could use 10w30 to 20w50 depending on
> your weather (outside ambient temperature).
Which of those is for how cold a temperature, we won't be below 20 degrees I suspect.
John-Paul Winger / US+1 310 9231126 / NZ+64 21 997919 / lavidalocations@gmail.com / Skype: lavidalocations
On Dec 12, 2011, at 5:30 PM, Emery Stora <emerystora@mac.com> wrote:
> Your owners manual is 33 to 38 years old. Oils have changed
> dramatically over those years. Ignore your manual totally on this
> subject. As you found, some of the recoendef oil weights don't exist
> now.
>
> There are oils today that weren't even thought of back then.
>
> I use Mobil 1 totally synthetic in a 15w50 weight. We travel to
> relatively warm areas in the summer and live in a cold climate in the
> winter. It hasbeen about 20 deg average here the last three weeks.
> This grade will work for us throughout the year.
>
> Of you are using mineral oil you could use 10w30 to 20w50 depending on
> your weather (outside ambient temperature).
>
>
>
> Emery Stora
> Santa Fe, NM
>
> On Dec 12, 2011, at 2:25 PM, JP Winger <lavidalocations@gmail.com>
> wrote:
>
>> Hi,
>>
>> According to my GMC olds 455manual I should be using sae 20w20
>> engine oil but it doesn't seem to exist, what's the appropriate
>> equivalent (for New York winter Avg 30 degrees).
>>
>> Here are my notes from the manual....
>>
>> Only SE engine oil, single grade oils best, multigrade ie. sae
>> 10w-30 or 10w-40 ok
>> Sae 5w-20 oils not rec for sustained high speeds
>> Sae 5w-30 oils may b used if extreme low temp anticipated.
>> Sae 30 = 40-120 degrees, sae 20w20 = 10-80deg, sae10w = -10-60deg
>>
>> Thanks,
>> JP
>>
>> John-Paul Winger / US+1 310 9231126 / NZ+64 21 997919 / lavidalocations@gmail.com
>> / Skype: lavidalocations
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] 20w 20 [message #152708 is a reply to message #152695] |
Mon, 12 December 2011 18:22 |
JP Winger
Messages: 86
Registered: September 2011
Karma: 0
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Member |
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Thanks, a rare event the thrashing.
John-Paul Winger / US+1 310 9231126 / NZ+64 21 997919 / lavidalocations@gmail.com / Skype: lavidalocations
On Dec 12, 2011, at 5:44 PM, "Rob Mueller" <robmueller@iinet.net.au> wrote:
> JP,
>
> I'm going to help you despite the fact that your bowlers THRASHED us yesterday in Hobart! ;-)
>
> Oil formulations have advanced significantly since the GMC manual was published.
>
> Go to Wal Mart and buy some Rotella T 15W- 40 and you're good to go.
>
> You will receive recommendations that you put an additive called ZDDP in with it to prevent the tappets from wearing into the cam
> shaft; however, there are two schools of thought on that.
>
> One says you must add it, the second says it is critical only when breaking in a new engine.
>
> I ran Double Trouble on Rotella T 15W - 40 for three summer tours (about 5000 miles each) and never added anything and so far so
> good.
>
> Regards,
> Rob M.
>
>
> -----Original Message-----
> From: Of JP Winger
>
> Hi,
>
> According to my GMC olds 455manual I should be using sae 20w20 engine oil but it doesn't seem to exist, what's the appropriate
> equivalent (for New York winter Avg 30 degrees).
>
> Here are my notes from the manual....
>
> Only SE engine oil, single grade oils best, multigrade ie. sae 10w-30 or 10w-40 ok
> Sae 5w-20 oils not rec for sustained high speeds
> Sae 5w-30 oils may b used if extreme low temp anticipated.
> Sae 30 = 40-120 degrees, sae 20w20 = 10-80deg, sae10w = -10-60deg
>
> Thanks,
> JP
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] 20w 20 [message #152719 is a reply to message #152708] |
Mon, 12 December 2011 19:10 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Wally World has Shell Rotella 15W40, as does AutoZone, and Tractor supply and any truck stop. Wally World will be the cheapest and the truck stop will be the most expensive.
I couldn't believe it but the Duty Free shop (Canadian Side) when I came back from Canada a few weeks ago even sold it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] 20w 20 [message #152744 is a reply to message #152719] |
Mon, 12 December 2011 20:57 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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""I couldn't believe it but the Duty Free shop (Canadian Side) when I came back from Canada a few weeks ago even sold it. ""
That's a surprise! Definitely got a chuckle out of that one!
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] 20w 20 [message #152767 is a reply to message #152744] |
Mon, 12 December 2011 22:15 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Bob de Kruyff wrote on Mon, 12 December 2011 20:57 |
""I couldn't believe it but the Duty Free shop (Canadian Side) when I came back from Canada a few weeks ago even sold it. ""
That's a surprise! Definitely got a chuckle out of that one!
|
Yes there was about 1/4 of a pallet there with a 19.95 price on it for a 5 liter bottle. In my opinion that was not a good price. It is cheaper at US Walmarts and TSC. I think I saw it at around $12.00 at TSC for a 4 quart bottle.
I did not quite understand as that was the only automotive product in the entire store.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] 20w 20 [message #152797 is a reply to message #152762] |
Tue, 13 December 2011 11:46 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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| Hal Kading wrote on Mon, 12 December 2011 20:56 |
Bob,
What's your thinking on oils for the GMC? My recent research leans toward 0W30 or 5W30. (Which are way lower grades than I have used!)
Hal Kading 78 Buskirk Stretch Las Cruces NM
|
I think I have tried them all over the years. Living in AZ, I tend toward the higher viscosities and normally stick with straight 30 or 40 weight although they can be tough to find at times. I'm a big fan of synthetics and if I were to use multi viscosity oil I would use synthetic so that the oil isn't composed largely of viscosity modifiers that don't contribute to lubrication. Most newer vehicles are spec'd with low viscosity oils for fuel economy purposes so don't be fooled by that for our usage. I think a good 10w30 is a safe bet for most of the country. I've always used a can of concentrated moly additive and although I can't tell the difference on the GMC, it sure makes the newer roller lifter engines more quiet.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] 20w 20 [message #152798 is a reply to message #152767] |
Tue, 13 December 2011 11:47 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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""Yes there was about 1/4 of a pallet there with a 19.95 price on it for a 5 liter bottle. In my opinion that was not a good price. It is cheaper at US Walmarts and TSC. I think I saw it at around $12.00 at TSC for a 4 quart bottle.
I did not quite understand as that was the only automotive product in the entire store. ""
That's not a great price is it--very curious.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] 20w 20 [message #152863 is a reply to message #152677] |
Tue, 13 December 2011 20:04 |
winter
Messages: 247
Registered: September 2007
Location: MPLS MN
Karma: 0
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Senior Member |
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I think new oils today are formulated with additive packages designed for todays tight clearance efi "clean running" engines. I think they are designed for thin film thickness on high speed parts with low friction. The older engines are lower speed and need thicker film thickness and make a lot more soot.
I use rotella 15w-40 in my diesel chevy pickup and also in my coach. The oil is usually used up due to how much soot its picked up rather than shear down, oxidation, or additive package being used up. Fleet Farm usually has the best price.
As for the thinner oil, I think it would just leak past my rings or seals. That would keep the oil new in the engine but it makes a mess.
Jerrod Winter
1977 Palm Beach
Green Jelly Bean
Twin Cities, Minnesota
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| Re: [GMCnet] 20w 20 [message #152912 is a reply to message #152798] |
Wed, 14 December 2011 02:28 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Bob de Kruyff wrote on Tue, 13 December 2011 11:47 |
""Yes there was about 1/4 of a pallet there with a 19.95 price on it for a 5 liter bottle. In my opinion that was not a good price. It is cheaper at US Walmarts and TSC. I think I saw it at around $12.00 at TSC for a 4 quart bottle.
I did not quite understand as that was the only automotive product in the entire store. ""
That's not a great price is it--very curious.
|
I did not ask. I was more concerned with getting across the bridge. It was almost midnight, raining, and right at freezing. I could not get the guy with me out of the duty free shop. In the end he just bought a bunch of junk. I did not see any great deals there myself. I drank two free cups of coffee while waiting for him and finally left without buying anything.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] 20w 20 [message #152930 is a reply to message #152677] |
Wed, 14 December 2011 10:39 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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Rob when you say use Rotella, that is is brand name of Shell for and entire product line. You don't say Dino or Syn. For what it's worth I have used Rotella full Syn 5w-40 with no known problems. I figure the 5 will give faster flow on cold or dormant startups and the 40 would be good for road. However the new formula CJ-4 has less zddp to meet the DEF diesel requirments. Haven't used that yet, but all I could find as CI-4 is now gone.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] 20w 20 [message #152941 is a reply to message #152707] |
Wed, 14 December 2011 13:09 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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On Dec 12, 2011, at 5:20 PM, JP Winger wrote:
> Thanks.
> Does it matter if it's mixed with the existing oil or do I need an oil change.
>>
I would suggest changing the oil and the filter.
> Which of those is for how cold a temperature, we won't be below 20 degrees I suspect.
>
either 15 w 50 or 10 w 30 would work fine.
The oil will thicken as the engine warms up.
You might be interest in an article that I wrote several years ago.
see
> John-Paul Winger / US+1 310 9231126 / NZ+64 21 997919 / lavidalocations@gmail.com / Skype: lavidalocations
>
> On Dec 12, 2011, at 5:30 PM, Emery Stora <emerystora@mac.com> wrote:
>
>> Your owners manual is 33 to 38 years old. Oils have changed
>> dramatically over those years. Ignore your manual totally on this
>> subject. As you found, some of the recoendef oil weights don't exist
>> now.
>>
>> There are oils today that weren't even thought of back then.
>>
>> I use Mobil 1 totally synthetic in a 15w50 weight. We travel to
>> relatively warm areas in the summer and live in a cold climate in the
>> winter. It hasbeen about 20 deg average here the last three weeks.
>> This grade will work for us throughout the year.
>>
>> Of you are using mineral oil you could use 10w30 to 20w50 depending on
>> your weather (outside ambient temperature).
>>
>>
>>
>> Emery Stora
>> Santa Fe, NM
>>
>> On Dec 12, 2011, at 2:25 PM, JP Winger <lavidalocations@gmail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> According to my GMC olds 455manual I should be using sae 20w20
>>> engine oil but it doesn't seem to exist, what's the appropriate
>>> equivalent (for New York winter Avg 30 degrees).
>>>
>>> Here are my notes from the manual....
>>>
>>> Only SE engine oil, single grade oils best, multigrade ie. sae
>>> 10w-30 or 10w-40 ok
>>> Sae 5w-20 oils not rec for sustained high speeds
>>> Sae 5w-30 oils may b used if extreme low temp anticipated.
>>> Sae 30 = 40-120 degrees, sae 20w20 = 10-80deg, sae10w = -10-60deg
>>>
>>> Thanks,
>>> JP
>>>
>>> John-Paul Winger / US+1 310 9231126 / NZ+64 21 997919 / lavidalocations@gmail.com
>>> / Skype: lavidalocations
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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Emery Stora
77 Kingsley
Santa Fe, NM
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| Re: [GMCnet] 20w 20 [message #152946 is a reply to message #152707] |
Wed, 14 December 2011 14:07 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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Senior Member |
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On Dec 12, 2011, at 5:20 PM, JP Winger wrote:
> Thanks.
> Does it matter if it's mixed with the existing oil or do I need an oil change.
>>
I would suggest changing the oil and the filter.
> Which of those is for how cold a temperature, we won't be below 20 degrees I suspect.
>
either 15 w 50 or 10 w 30 would work fine.
The oil will thicken as the engine warms up.
You might be interest in an article that I wrote several years ago on oils and in particular synthethic oils.
see http://www.gmcws.org/techcenter/01-08tc34.html
Emery Stora
> John-Paul Winger / US+1 310 9231126 / NZ+64 21 997919 / lavidalocations@gmail.com / Skype: lavidalocations
>
> On Dec 12, 2011, at 5:30 PM, Emery Stora <emerystora@mac.com> wrote:
>
>> Your owners manual is 33 to 38 years old. Oils have changed
>> dramatically over those years. Ignore your manual totally on this
>> subject. As you found, some of the recoendef oil weights don't exist
>> now.
>>
>> There are oils today that weren't even thought of back then.
>>
>> I use Mobil 1 totally synthetic in a 15w50 weight. We travel to
>> relatively warm areas in the summer and live in a cold climate in the
>> winter. It hasbeen about 20 deg average here the last three weeks.
>> This grade will work for us throughout the year.
>>
>> Of you are using mineral oil you could use 10w30 to 20w50 depending on
>> your weather (outside ambient temperature).
>>
>>
>>
>> Emery Stora
>> Santa Fe, NM
>>
>> On Dec 12, 2011, at 2:25 PM, JP Winger <lavidalocations@gmail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> According to my GMC olds 455manual I should be using sae 20w20
>>> engine oil but it doesn't seem to exist, what's the appropriate
>>> equivalent (for New York winter Avg 30 degrees).
>>>
>>> Here are my notes from the manual....
>>>
>>> Only SE engine oil, single grade oils best, multigrade ie. sae
>>> 10w-30 or 10w-40 ok
>>> Sae 5w-20 oils not rec for sustained high speeds
>>> Sae 5w-30 oils may b used if extreme low temp anticipated.
>>> Sae 30 = 40-120 degrees, sae 20w20 = 10-80deg, sae10w = -10-60deg
>>>
>>> Thanks,
>>> JP
>>>
>>> John-Paul Winger / US+1 310 9231126 / NZ+64 21 997919 / lavidalocations@gmail.com
>>> / Skype: lavidalocations
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Emery Stora
77 Kingsley
Santa Fe, NM
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| Re: [GMCnet] 20w 20 [message #153005 is a reply to message #152966] |
Wed, 14 December 2011 23:05 |
hal kading
Messages: 642
Registered: February 2004
Location: Las Cruces NM
Karma: 4
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Senior Member |
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Emery,
We do travel a fair amount where it's cold. I've studied this internet site <www.bobistheoilguy.com> a fair amount. The information on Bob's site is that most wear occurs at start up when the oil is cold. A 0W30, 5W30 or a 10W30 oil is thinner and circulates much better when cold and still has essentially the same viscosity as a 30 wt when warmed up to 100* C. As far as the warmed up viscosity Bob recommends the lightest weight oil that will maintain 10 psi oil pressure per 1000 rpm, ie. 30 psi at 3000 rpm. The light wt oil at start up cold I agree with. I'm not so sure about the 10 psi per 1000 rpm for our heavy GMC's.
Hal Kading 78 Buskirk Las Cruces NM
Hal Kading 1978 Buskirk Stretch 502 Las Cruces NM
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