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#3460765 - 08/20/14 09:14 PM 2014 Silverado: now using 75w-85?? Amsoil question
zuluplus30 Offline


Registered: 11/23/13
Posts: 264
Loc: Fly-Over Country
Wife's 2014 Silverado just rolled 5k miles. I usually do a flush of the front and rear diffs and transfer case at this mileage for peace of mind. Apparently GM in a quest for CAFE standards is now using a proprietary 75w-85 GL-5 synthetic rear end fluid as opposed to the old standard 75w-90 grape juice. Any body know if the rear ends are carryovers from the previous years? I always use Amsoil SVG in both front and rears of my previous GM half tons. Should I stick with the 75w-85 GM fluid? Only other 75w-85 I can find is Redline but it's GL-4 so that a no go.

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#3460778 - 08/20/14 09:25 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: zuluplus30]
01_celica_gt Offline


Registered: 07/29/13
Posts: 1764
Loc: St. Louis, MO
your wife has a truck? she is bad[censored]


Edited by 01_celica_gt (08/20/14 09:25 PM)
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#3460784 - 08/20/14 09:27 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: 01_celica_gt]
zuluplus30 Offline


Registered: 11/23/13
Posts: 264
Loc: Fly-Over Country
Lol she's a country girl. Nothing hotter than a country girl driving a killer truck. It's worth the price of admission.

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#3460806 - 08/20/14 09:42 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: zuluplus30]
01_celica_gt Offline


Registered: 07/29/13
Posts: 1764
Loc: St. Louis, MO
that is awesome, cooler then a guy driving a truck.
lol i couldn't image my wife in a truck, she is only 5 feet tall...
But since getting her car she has become a somewhat of a bad[censored] driver though.
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#3460808 - 08/20/14 09:43 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: zuluplus30]
Greasymechtech Offline


Registered: 07/11/14
Posts: 1544
Loc: Paradise of Florida
I use 75w90 in place of 75w85.
Price OE fluid at the dealer and tell them where to shove....

I'd use the Amsoil.
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#3460827 - 08/20/14 10:14 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: zuluplus30]
zrxkawboy Offline


Registered: 11/30/04
Posts: 1541
Loc: SD
I'd use a quality syn 75W90.
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#3460837 - 08/20/14 10:31 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: zuluplus30]
147_Grain Offline


Registered: 03/11/13
Posts: 1944
Loc: USA
Amsoil Severe Gear 75W-90 will likely equal or outperform the factory fill.

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#3460867 - 08/20/14 11:20 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: zuluplus30]
oldhp Offline


Registered: 06/28/12
Posts: 1278
Loc: Southern Illinois
I changed to RedLine 75W90 gear oil, guess what happened to MPG? Nothing.
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#3460868 - 08/20/14 11:21 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: zuluplus30]
barkingspider Offline


Registered: 12/22/13
Posts: 1494
Loc: socal
I would use OEM until the truck is out of warranty.
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#3460874 - 08/20/14 11:43 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: zuluplus30]
901Memphis Offline


Registered: 08/14/10
Posts: 11959
Loc: Northern Kentucky
Redline 75w90 is superior to the Gm stuff.
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#3460974 - 08/21/14 06:33 AM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: 01_celica_gt]
beanoil Offline


Registered: 10/17/04
Posts: 2452
Loc: Midwest, Illinois
Originally Posted By: 01_celica_gt
that is awesome, cooler then a guy driving a truck.
lol i couldn't image my wife in a truck, she is only 5 feet tall...
But since getting her car she has become a somewhat of a bad[censored] driver though.

OT, but my wife is 5'1" and she climbs right on up into the F350, drives to the storage area, hooks up the TT, and backs it into whatever campground she chooses. Now that is pretty BA, IMO. Back on topic, a syn 75w90 should do just fine.
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#3461642 - 08/21/14 06:21 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: 01_celica_gt]
jk_636 Offline


Registered: 08/03/14
Posts: 1750
Loc: Kentucky
Am I wrong in thinking that 75w-85 just seems a little light for a pickup? Especially if you plan on towing with it? The rear differential in my truck and others that I have looked at always called for a 75w-140 or something similar in the rear. As for the fluid, Amsoil Severe Gear or Royal Purple Max Gear would do the trick. thumbsup
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#3461666 - 08/21/14 06:41 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: jk_636]
MolaKule Offline


Registered: 06/05/02
Posts: 17874
Loc: Iowegia - USA
Originally Posted By: jk_636
Am I wrong in thinking that 75w-85 just seems a little light for a pickup? As for the fluid, Amsoil Severe Gear or Royal Purple Max Gear would do the trick. thumbsup


If the gear lube has the proper GL-5 additive package (which I would assume it does), I don't see it as too thin.

New teeth hardening methods and tooth finishes allow a slightly thinner fluid.

A 75W85 is primarily for the benefit of fleet CAFE figures.

If you don't mind a very slight mpg hit, then my recommendation is to use a synthetic or a semi-synthetic in SAE 75W110.



Edited by MolaKule (08/21/14 06:43 PM)
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#3462318 - 08/22/14 12:50 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: zuluplus30]
Ken2 Offline


Registered: 12/02/02
Posts: 6375
Loc: Washington St.
Quote:
Am I wrong in thinking that 75w-85 just seems a little light
An aircraft carrier uses 30 wt turbine oil in its 65,000 hp gears. It all depends on the design.
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#3462567 - 08/22/14 06:33 PM Re: 2014 Silverado: now using 75w-85?? Amsoil question [Re: zuluplus30]
bdleonard Offline


Registered: 08/20/03
Posts: 28
Loc: Rome, NY
FYI, Redline sells a GL-5 75w85. It is in my rear diff right now.
Redline 75w85 GL-5

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