GM's "synthetic" 75w90 "Grape Juice"

[RavenTai]

I am just about to do my silverado's 50k rear diff change, I have stuck with the expensive GM stuff as no one else technically meets their specification and some have reported chatter of the G80 Auburn locker with other synthetics

I was looking at the back of the bottle and found some ingredients listed maybe one of you oil smart people here can make a judgment of what this is and what we could safely use as a substitute?

“Heavy Duty SAE 75-90 extreme pressure GL-5 axle lubricant, new grape sent”

code:

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Contains:

Hydrogenated trimer and tetramer of decene CAS #68649-12-7

Propene, 2-methyl-, polymers- CAS #9003-27-4

Mineral oil, Petroleum distillates, solvent refined (severe) - CAS #64741-97-5

Amines, C12-14-tert-alkyl, reaction products with 0.0-di-C1- Cas #71888-91-0

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I sure don't like paying big money for 4 quarts of this stuff and finding plain old "mineal oil" as one of its ingredients, isint severe solvent refined mineral oil one way to make group III oil? hopefully some of those other ingredients are actually good stuff and I did not just blow 70$ on a cheap group III gear lube

I have a suspicion that a good synthetic and a little friction modifier would work with no chatter

[ October 22, 2003, 06:50 AM: Message edited by: RavenTai ]

 

[Rat407]

Well I can say this much. I switched out my rear, and front diff's to AMSOIL's Series 2k 75w-90 gear lube and have not had a bit of problems out of them. So far I have 30k with it in there.

I know of several others that have done the same and are happy with no problems as well. No need for friction modifier. For one the G80 does not have clutches and two it already is in the AMSOIL gear lube.

[ October 22, 2003, 06:48 AM: Message edited by: Rat407 ]

 

[doyall]

quote:

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hopefully some of those other ingredients are actually good stuff and I did not just blow 70$ on a cheap group III gear lube

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From MolaKule's article at http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=4;t=000226

quote:

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no high viscosity Group III has yet been produced

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I'm willing to bet that the "Hydrogenated trimer and tetramer of decene" is a Group IV oil. And I also would be willing to bet that the solvent refined stuff is a Group I oil.

Kinda makes the Coastal Synthetic GL not look too bad at $5.99/qt.

[ October 22, 2003, 10:33 AM: Message edited by: doyall ]

 

[pgtr]

What is the GM part# on that lubricant?

Also does it claim any specific API GL or other non-GM specs on the bottle?

Does it meet a specific GM spec that is also referenced in your owners manual or factory service manual?

thanks,

[ October 22, 2003, 10:38 AM: Message edited by: pgtr ]

 

[MolaKule]

Contains:
Hydrogenated trimer and tetramer of decene CAS #68649-12-7

[This is a mixture of PAO base oils]

Propene, 2-methyl-, polymers- CAS #9003-27-4

[This is VII and Friction Modifier]

Mineral oil, Petroleum distillates, solvent refined (severe) - CAS #64741-97-5

[Heavy mineral oil or brightstock to thicken oil]

Amines, C12-14-tert-alkyl, reaction products with 0.0-di-C1- Cas #71888-91-0

[Surfactant, Antioxidant and friction modifiers].

They do not state the EP additives since this info is proprietary.

Yep Pennzoil Synthetic, Coastal Synthetic, Amsoil Synthetic, Schaeffer's blends, or Redline GL's look like a better deal. In fact, I think doyall is correct, looks more like Coastal Synthetic.

[ October 22, 2003, 11:33 AM: Message edited by: MolaKule ]

 

[sbc350gearhead]

When did GM stop using eaton units?

 

[RavenTai]

quote:

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Originally posted by Rat407:
Well I can say this much. I switched out my rear, and front diff's to AMSOIL's Series 2k 75w-90 gear lube and have not had a bit of problems out of them. So far I have 30k with it in there.

I know of several others that have done the same and are happy with no problems as well. No need for friction modifier. For one the G80 does not have clutches and two it already is in the AMSOIL gear lube.

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no clutches? Eaton says it has carbon friction disc's, are these not clutches? Glad to hear Amsoil gives no troubles. I have been trying to stay away form them but this may change

quote:

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Originally posted by doyall:
Kinda makes the Coastal Synthetic GL not look too bad at $5.99/qt.

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LOL, you got that right, the dealer wants $30 a quart

I got a “deal” for $18 shipped

quote:

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Originally posted by pgtr:
What is the GM part# on that lubricant?

Also does it claim any specific API GL or other non-GM specs on the bottle?

Does it meet a specific GM spec that is also referenced in your owners manual or factory service manual?

thanks,

---

the owners manual call for GM part# 12378261 OR equivalent meeting GM specification 9986115 from what I can find none of the gear lube manufactures mention meeting this spec they all probably do but don't explicitly say so, for all I know the spec is gl-5 with grape sent added. The old bottles I got the first time I did the axle change it only health warnings and ingredients, on the new bottle there is a short paragraph saying how great the fluid is and also says it “is a heavy duty extreme pressure GL-5 axle lubricant”

I have read that this fluid is made by Texaco part # 2276 but I have not found any for sale

quote:

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Originally posted by MolaKule:
Contains:
Hydrogenated trimer and tetramer of decene CAS #68649-12-7

[This is a mixture of PAO base oils]

Propene, 2-methyl-, polymers- CAS #9003-27-4

[This is VII and Friction Modifier]

Mineral oil, Petroleum distillates, solvent refined (severe) - CAS #64741-97-5

[Heavy mineral oil or brightstock to thicken oil]

Amines, C12-14-tert-alkyl, reaction products with 0.0-di-C1- Cas #71888-91-0

[Surfactant, Antioxidant and friction modifiers].

They do not state the EP additives since this info is proprietary.

Yep Pennzoil Synthetic, Coastal Synthetic, Amsoil Synthetic, Schaeffer's blends, or Redline GL's look like a better deal. In fact, I think doyall is correct, looks more like Coastal Synthetic.

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Thank you that is the info I was looking for, so this is group IV (pao) oil with a friction modifier so I could recreate this with a good synthetic that meats GL-5 and friction modifier additive (or one that already has it) right?

quote:

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Originally posted by sbc350gearhead:
When did GM stop using eaton units?

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they never did I got confused, I would edit my post but it says it is to late to do so :/

 

[pgtr]

Interesting. Yet another part# from GM. The label on this one clearly says "Synthetic _Axle_ Lubricant" "75W-90". THe 'axle' part would certainly suggest GL-5.

I'm starting to wonder just how many different 'lubes' GM is floating around out there? And what about old fashioned 1052271 80W90 Axle Lube? I wonder if it meets the same spec or what makes them suggest one over the other.

Bottom line is that it would be nice to have a complete 'catalog' of their lubricants and whatever 'GM' spec(s) they meet. But like most car manufacturer websites, they are sparse on this type of info. It's almost like the manufacturers intentionally don't want to promote their own brands of lubricants much beyond internal usage or walk-in customers owning their vehicles. Strange.

 

[RavenTai]

quote:

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Originally posted by pgtr:
Interesting. Yet another part# from GM. The label on this one clearly says "Synthetic _Axle_ Lubricant" "75W-90". THe 'axle' part would certainly suggest GL-5.

I'm starting to wonder just how many different 'lubes' GM is floating around out there? And what about old fashioned 1052271 80W90 Axle Lube? I wonder if it meets the same spec or what makes them suggest one over the other.

Bottom line is that it would be nice to have a complete 'catalog' of their lubricants and whatever 'GM' spec(s) they meet. But like most car manufacturer websites, they are sparse on this type of info. It's almost like the manufacturers intentionally don't want to promote their own brands of lubricants much beyond internal usage or walk-in customers owning their vehicles. Strange.

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I think they moved to synthetic 75-90 to improve CAFE average mileage as it is used in all the trucks and suv's from '01, and posibly even the rest of the fleet. with the market wanting heavy trucks and suv's and the EPA wanting little 4-banger death traps that puts GM in a hard spot with fuel economy, this stuff is very thin it almost engine oil


GM is tightliped about the fluid, makes you paranoid to use anything else

 

[Ken2]

Schaeffer's #741 synthetic 75W-90 meets GM's spec, also meets Eaton's 750,000 mile warranty spec. $151.20 per 40# pail.


Ken