Home » Public Forums » GMCnet » Best oil to use?
| Best oil to use? [message #214603] |
Tue, 16 July 2013 11:48  |
Otterwan
Messages: 946
Registered: July 2013
Location: Lynnwood (north of Seattl...
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Once again research only adds to the confusion. Manual says to use straight 30 wt and that 10W30-10W40 are "acceptable". Many on the interwebz recommend Mobil 1 15W50. I have no problem with paying for full synthetic if the motor likes it.
So what do folks actually run? FWIW 1976 455 with 85K original miles, no smoke at all.
1977 Birchaven, Lynnwood WA - "We may not be able to stop all evil in the world, but I know that how we treat one another is entirely up to us."
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| Re: [GMCnet] Best oil to use? [message #214607 is a reply to message #214603] |
Tue, 16 July 2013 12:20  |
mtnman111
Messages: 20
Registered: August 2004
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I'm convinced that dura lub is the gold standard. It was in 1989 when I came upon a fellow demonstrating Mac products, he had the friction machine where you oil a friction surface with a few drops then apply pressure til it seizes . I handed him a bottle of dura lub which I had just purchased at target. There was only he and I no others were present. He was using Quaker state Dino oil, he added a few drops of my dura lub to the Quaker state mixed it up then with drew all lub, the spun it up then added the pressure, he could. Not make the devise seize, while the Quaker state alone seized at 25 lbs on the torque wrench. The torque wrench had a max reading of 150 lbs with the dura lub and the devise kept turning. Since that day I've added dura lube to every oil I use, even in my lawn mower, any electric motor, and certainly my auto engines.you are getting the raw truth, I have no dog in this fight. Good luck. 74 glacier.
Have a great day, larry c.
On Jul 16, 2013, at 9:49 AM, David Orders <dao@oarsllc.com> wrote:
>
>
> Once again research only adds to the confusion. Manual says to use straight 30 wt and that 10W30-10W40 are "acceptable". Many on the interwebz recommend Mobil 1 15W50. I have no problem with paying for full synthetic if the motor likes it.
>
> So what do folks actually run? FWIW 1976 455 with 85K original miles, no smoke at all.
> --
> 1976 Royale "Twinkie II"
>
> "Aspergers syndrome, or something like that. A talent for seeing patterns and understanding abstract reasoning where other people perceive only white noise." - Mikael Blomkvist, The Girl with the Dragon Tattoo.
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L Conley 260 glacier
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| Re: Best oil to use? [message #214611 is a reply to message #214603] |
Tue, 16 July 2013 13:49 |
jknezek
Messages: 1057
Registered: December 2007
Karma: 5
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| Otterwan wrote on Tue, 16 July 2013 12:48 |
Once again research only adds to the confusion. Manual says to use straight 30 wt and that 10W30-10W40 are "acceptable". Many on the interwebz recommend Mobil 1 15W50. I have no problem with paying for full synthetic if the motor likes it.
So what do folks actually run? FWIW 1976 455 with 85K original miles, no smoke at all.
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For your purposes, I stand by my comment that it really doesn't matter. 10W30, 10W40, 15W50, dino, regular, zinc additive, diesel oil... we have many, many owners running each of these options. While engines fail for a lot of reasons, a properly filled and changed oil pan with a reputable oil with reasonable viscosity is probably not going to be your problem.
Pick your favorite and go with it. If one oil was the solution we'd have all switched conclusively to it by now. The fact that we have so many ideas and so many people running options should be enough proof that it doesn't matter all that much. Change the oil regularly, keep an eye on how much is in the pan and how much you burn, and a "bad" oil will probably not be the cause of a failure on a 35+ year old engine.
For the record, I run MobilOne 10W40 High Mileage synthetic since I run it in other vehicles as well. I like having 1 oil around the house and, while it's probably more expensive than my personal theory indicates is necessary, it works for me. I wouldnt recommend it, nor would I tell someone ANY reputable oil is the wrong one to use...
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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| Re: [GMCnet] Best oil to use? [message #214614 is a reply to message #214611] |
Tue, 16 July 2013 14:14 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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Listen to Bob DeK. He manages a huge fleet of U-haul trucks. Use your
choice of oils, change it at regular intervals, filter every other change,
and drive them often enough to burn off the condensation. They will last a
long time if you do.
Jim Hupy
Salem,
On Jul 16, 2013 11:49 AM, "Jeremy" <jtknezek@hotmail.com> wrote:
>
>
> Otterwan wrote on Tue, 16 July 2013 12:48
> > Once again research only adds to the confusion. Manual says to use
> straight 30 wt and that 10W30-10W40 are "acceptable". Many on the interwebz
> recommend Mobil 1 15W50. I have no problem with paying for full synthetic
> if the motor likes it.
> >
> > So what do folks actually run? FWIW 1976 455 with 85K original miles, no
> smoke at all.
>
>
>
> For your purposes, I stand by my comment that it really doesn't matter.
> 10W30, 10W40, 15W50, dino, regular, zinc additive, diesel oil... we have
> many, many owners running each of these options. While engines fail for a
> lot of reasons, a properly filled and changed oil pan with a reputable oil
> with reasonable viscosity is probably not going to be your problem.
>
> Pick your favorite and go with it. If one oil was the solution we'd have
> all switched conclusively to it by now. The fact that we have so many ideas
> and so many people running options should be enough proof that it doesn't
> matter all that much. Change the oil regularly, keep an eye on how much is
> in the pan and how much you burn, and a "bad" oil will probably not be the
> cause of a failure on a 35+ year old engine.
>
> For the record, I run MobilOne 10W40 High Mileage synthetic since I run it
> in other vehicles as well. I like having 1 oil around the house and, while
> it's probably more expensive than my personal theory indicates is
> necessary, it works for me. I wouldnt recommend it, nor would I tell
> someone ANY reputable oil is the wrong one to use...
> --
> Thanks,
> Jeremy Knezek
> 1976 Glenbrook
> Birmingham, AL
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] Best oil to use? [message #214637 is a reply to message #214611] |
Tue, 16 July 2013 18:10 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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I use either Rotella or Delo, 15-40, whichever's cheaper on oil change weekend in the toad and the GMC. The Ranger and Grand Caravan get 5W-20 of usually Pennzoil, Quaker State, or Valvoline, whichever is cheaper. Often 'cheaper' means a throw - in filter. The GMC is the lowest mileage of the four, none have ever had an oil related problem..... nor do I expect one in the future.
--johnny
'76 23' transmode Norris
'76 palm beach
--------------------------------------------
On Tue, 7/16/13, Jeremy <jtknezek@hotmail.com> wrote:
Subject: Re: [GMCnet] Best oil to use?
To: gmclist@temp.gmcnet.org
Date: Tuesday, July 16, 2013, 6:49 PM
Otterwan wrote on Tue, 16 July 2013 12:48
> Once again research only adds to the confusion. Manual
says to use straight 30 wt and that 10W30-10W40 are
"acceptable". Many on the interwebz recommend Mobil 1 15W50.
I have no problem with paying for full synthetic if the
motor likes it.
>
> So what do folks actually run? FWIW 1976 455 with 85K
original miles, no smoke at all.
For your purposes, I stand by my comment that it really
doesn't matter. 10W30, 10W40, 15W50, dino, regular, zinc
additive, diesel oil... we have many, many owners running
each of these options. While engines fail for a lot of
reasons, a properly filled and changed oil pan with a
reputable oil with reasonable viscosity is probably not
going to be your problem.
Pick your favorite and go with it. If one oil was the
solution we'd have all switched conclusively to it by now.
The fact that we have so many ideas and so many people
running options should be enough proof that it doesn't
matter all that much. Change the oil regularly, keep an eye
on how much is in the pan and how much you burn, and a "bad"
oil will probably not be the cause of a failure on a 35+
year old engine.
For the record, I run MobilOne 10W40 High Mileage synthetic
since I run it in other vehicles as well. I like having 1
oil around the house and, while it's probably more expensive
than my personal theory indicates is necessary, it works for
me. I wouldnt recommend it, nor would I tell someone ANY
reputable oil is the wrong one to use...
--
Thanks,
Jeremy Knezek
1976 Glenbrook
Birmingham, AL
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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] Best oil to use? [message #214638 is a reply to message #214614] |
Tue, 16 July 2013 18:17 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Remember the oil commercial some decades ago when they filled a taxi, drained it, and then did a shift in New York with it? Some pundit in one of the aviation mags had the answer: Let's put some teeth in it. Take a Twin Beech and drain the oil from both sides. Leave Miami, the course is 090, and see how far it goes. Much more interesting, I thought.
--johnny
--------------------------------------------
On Tue, 7/16/13, James Hupy <jamesh1296@gmail.com> wrote:
Subject: Re: [GMCnet] Best oil to use?
To: gmclist@temp.gmcnet.org
Date: Tuesday, July 16, 2013, 7:14 PM
Listen to Bob DeK. He manages a huge
fleet of U-haul trucks. Use your
choice of oils, change it at regular intervals, filter every
other change,
and drive them often enough to burn off the condensation.
They will last a
long time if you do.
Jim Hupy
Salem,
On Jul 16, 2013 11:49 AM, "Jeremy" <jtknezek@hotmail.com>
wrote:
>
>
> Otterwan wrote on Tue, 16 July 2013 12:48
> > Once again research only adds to the confusion.
Manual says to use
> straight 30 wt and that 10W30-10W40 are "acceptable".
Many on the interwebz
> recommend Mobil 1 15W50. I have no problem with paying
for full synthetic
> if the motor likes it.
> >
> > So what do folks actually run? FWIW 1976 455 with
85K original miles, no
> smoke at all.
>
>
>
> For your purposes, I stand by my comment that it really
doesn't matter.
> 10W30, 10W40, 15W50, dino, regular, zinc additive,
diesel oil... we have
> many, many owners running each of these options. While
engines fail for a
> lot of reasons, a properly filled and changed oil pan
with a reputable oil
> with reasonable viscosity is probably not going to be
your problem.
>
> Pick your favorite and go with it. If one oil was the
solution we'd have
> all switched conclusively to it by now. The fact that
we have so many ideas
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Unsubscribe or Change List Options:
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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] Best oil to use? [message #214655 is a reply to message #214638] |
Tue, 16 July 2013 19:52 |
stick miller
Messages: 1036
Registered: March 2010
Location: Americus, Georgia
Karma: 0
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Senior Member |
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This is a bit off subject, but what the hell? My father bought our company cars and leased them back to the sales force at the company. Our orders were never to change the oil or filter...just keep a check on oil level. Turn them in at 100K miles.
To my knowledge we never had an engine failure or a problem due to oil problems. At the end of the time, a 100K car is a 100K car. Made no difference in the value.
This was back in the 70's with mega V-8 Fords, Chevrolets and Plymouths.
Meanwhile, back on the topic......
Stick Miller
'78 Royale - "White Trash" - she left me for another man
'76 Eleganza - "Cousin Eddie" Sold
'84 Bluebird Wanderlodge - "Past Tents"
Americus, GA
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| Re: Best oil to use? [message #214659 is a reply to message #214603] |
Tue, 16 July 2013 20:30 |
Wander Inn
Messages: 100
Registered: January 2010
Location: Phoenix Az.
Karma: 0
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Senior Member |
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I was told that shouldn't mix brands of oil. And not to
change brands, pick one and stay with it.
Mike
Mike & Chris Hughes
1977 Kingsley
Phoenix, Az.
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| Re: [GMCnet] Best oil to use? [message #214670 is a reply to message #214655] |
Tue, 16 July 2013 23:56 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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I'd guess my father bought one of those. He never did have good luck with cars...
Larry Davick
A Mystery Machine
On Jul 16, 2013, at 5:52 PM, Stick Miller <stickmiller@gmail.com> wrote:
>
>
> This is a bit off subject, but what the hell? My father bought our company cars and leased them back to the sales force at the company. Our orders were never to change the oil or filter...just keep a check on oil level. Turn them in at 100K miles.
>
> To my knowledge we never had an engine failure or a problem due to oil problems. At the end of the time, a 100K car is a 100K car. Made no difference in the value.
>
> This was back in the 70's with mega V-8 Fords, Chevrolets and Plymouths.
>
> Meanwhile, back on the topic......
> --
> Stick Miller
> '78 Royale - she left me for another man
> '76 Eleganza
> Americus, Georgia
>
>
>
> _______________________________________________
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Best oil to use? [message #214673 is a reply to message #214661] |
Wed, 17 July 2013 01:25 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Robert Mueller wrote on Tue, 16 July 2013 21:06 |
David,
The thing to remember is that the MM was written in 1973 and the oil formulations back then were no where near as good as what is
available FORTY years later!
I run Shell Rotella T 15W-40 in Double Trouble.
Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
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Times 2
Shell Rotella 15W40
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Best oil to use? [message #214717 is a reply to message #214705] |
Wed, 17 July 2013 13:18 |
Emery Stora
Messages: 959
Registered: January 2011
Karma: 4
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Senior Member |
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Why anyone would ever put 5w into their engine is beyond my imagination.
Unless, of course you are at below 0 temperatures and driving short distances.
I use 15w50 Mobil 1 for years (not 15w40 as someone attributed to me earlier) and have camped in freezing conditions and 120 in Phoenix. It has worked well.
Emery Stora
On Jul 17, 2013, at 8:30 AM, "A." <markbb1@netzero.com> wrote:
>
>
> Robert Mueller wrote on Wed, 17 July 2013 10:00
>> Philip;
>>
>> Sorry but AFAIC with today's oil formulations STP = Snake Oil.
>>
>> I do add 5 oz of ZDDP but as BobDk notes that to is not necessary in an engine that is well broken in; it makes me feel good! ;)
>>
>> Regards,
>> Rob M.
>>
>> -----Original Message-----
>> From: Phillip Udel
>>
>> What ever oil, you should add some STP or other product with extra ZDDP/ZDTP
>> --
>> Phillip Udel - www.gmcfabrication.com I Own a 1975 Avion, Still removing the Mothballs after sitting in storage for 10+ year
> The current formulation of STP does not contain appreciable amounts of ZDDP. All it will do now is increase viscosity. If you find yourself having to put more than a quart of 5WXX oil in your GMC, then adding some STP is probably a good idea.
> --
> '73 23' Sequoia For Camping
> '73 23' CanyonLands For Sale
> UA (Upper Alabama)
> "Time is money. If you use YOUR time, you get to keep YOUR money."
> _______________________________________________
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| Re: [GMCnet] Best oil to use? [message #214732 is a reply to message #214698] |
Wed, 17 July 2013 15:30 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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| Robert Mueller wrote on Wed, 17 July 2013 10:00 |
Philip;
Sorry but AFAIC with today's oil formulations STP = Snake Oil.
Regards,
Rob M.
|
Well, that "snake oil" saved me a lot of trouble. I just did the heads on my Cad 500. Seems valves were sticking open because of a worn rocker system....long story. Anyway after I got it together with new rocker system, (taking lots of time to set the preload on lifters) I started the motor to find that three or more lifters were not pumping up properly. Lots of ticking noises coming from the valve train. I double checked preload and found nothing wrong. There was no reason why those lifters shouldn't pump up firm. Then I remembered, years ago, with many of the engines that I did a quick and dirty rebuilt on, if using the old lifters, sometimes the old lifters would collapse and refuse to pump up properly. Back then I use to just ad a bottle of STP and that seemed to take care of it....SOOO... I thought...what the hell, the only thing I can loose is the cost of one bottle of STP. I added a bottle of STP to my Cad. It took about 5 minutes for the STP to fully mix. The lifters pumped up and the ticking stopped. In the last month now, I have put on over 1000 miles...so far...so good. JWID
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: [GMCnet] Best oil to use? [message #214740 is a reply to message #214717] |
Wed, 17 July 2013 16:15 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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I run 15W50 Mobile 1 in the stretch coach. I have alway run a 15W50 in my coaches, the 77 Eleganza II from 1997 thru 2010 ( 60K miles ) without issue.
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
On Jul 17, 2013, at 2:18 PM, Emery Stora <emerystora@me.com> wrote:
> Why anyone would ever put 5w into their engine is beyond my imagination.
>
> Unless, of course you are at below 0 temperatures and driving short distances.
>
> I use 15w50 Mobil 1 for years (not 15w40 as someone attributed to me earlier) and have camped in freezing conditions and 120 in Phoenix. It has worked well.
>
> Emery Stora
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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