2016 Rear Differential Fluid/Rear Axle Fluid

AskMeAboutMySilverado · October 25, 2016

Finished the fluid change last night. Found quite a bit of metallic flake in the magnetic catches. Nothing to be concerned about, but the fluid was pretty dirty. Didn't really notice the flakes in the oil, but possible that as it was draining (and subsequently passing over the magnet) the flakes were caught. See pictures. Painted it for rust prevention.

dino688 · October 25, 2016

I hate the way it's marketed and sold; but you cannot go wrong running AMSOIL products in your truck.

? Hows it marketed and sold? I've always heard and seen the brand but never used it.

dorkweed · October 25, 2016

? Hows it marketed and sold? I've always heard and seen the brand but never used it.

You get distributors/marketers on these forums that push/push/push the product and then essentially "belittle" those that voice an alternative product that is essentially equally as good.

txab · October 25, 2016

You get distributors/marketers on these forums that push/push/push the product and then essentially "belittle" those that voice an alternative product that is essentially equally as good.

That's not occurring on this forum. The Amsoil vendor that posts here speaks well of other products when appropriate. So don't lump everyone into the same boat

sdeeter19555 · October 26, 2016

Ok, I'm going to ask this in a serious sense...just how much protection is one losing to an (whatever the GM) 85w versus the mileage loss in a (synthetic) 90w? Seems like the difference in mileage would be really hard see under normal conditions?

I guess it's a moot point when cars share the differential and transmission and use ATF.

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mookdoc6 · October 26, 2016

Ok, I'm going to ask this in a serious sense...just how much protection is one losing to an (whatever the GM) 85w versus the mileage loss in a (synthetic) 90w? Seems like the difference in mileage would be really hard see under normal conditions?

I guess it's a moot point when cars share the differential and transmission and use ATF.

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I bet it's like 1-2 tenths kinda like switching to 10W-30 or something hushes things up a tad and loosing a few tenths? When it comes time for mine I like the previous posters idea on going 90W and follow suit!

mookdoc6 · October 26, 2016

Finished the fluid change last night. Found quite a bit of metallic flake in the magnetic catches. Nothing to be concerned about, but the fluid was pretty dirty. Didn't really notice the flakes in the oil, but possible that as it was draining (and subsequently passing over the magnet) the flakes were caught. See pictures. Painted it for rust prevention.

Nice bro! Thanks for taking care of the hardest working that nobody cares about little brother in the world!

FL335i · October 28, 2016

I did my diff around 42k when I did the PML cover. Dealer did it at 15k when the RR axle seal blew out. That factory fill is for the birds. even with only 27k it was getting pretty dirty. I didn't go for the 85W MPG crap. Way to expensive. I bought a 5gallon bucket of this stuff and it showed up at my door 3 days later. Much cheaper per quart vs even retail M1, or the gold AC Delco stuff. The main thing is get a quality 75-90 Full Synthetic GL-5 rated gear oil. IF you have the G80 Locker, the friction modifier found in even M1 or other retail bottles is not recommended by EATON. I called and talked directly to their tech guy. He was very clear, no friction modifiers. I was not able to find 75/90 Syn Gl-5 on the shelf locally, and I was doing 4 diffs. 2 on my silverado and 2 on my '89 K5. Worked out perfect. And this stuff is "FE" Fuel Efficient. So it's thin 75/90. The 75/85 is for GM to get .1 more MPG on the CAFE. Toyota uses some thin gear oil also... I use my truck as a truck in industrial construction. .1mpg does not matter, getting 250k does. If I cared about the MPG impact between 75/85 and 75/90 then my E load KO2's are really a no no.

Here you go... G80 happy:

http://www.phillips66lubricants.com/documents/conoco/industrial_oils/FOB%20Triton%20Syngear%20FE%20TDSw%20828151.pdf

Edited October 28, 2016 by FL335i

mookdoc6 · October 28, 2016

I did my diff around 42k when I did the PML cover. Dealer did it at 15k when the RR axle seal blew out. That factory fill is for the birds. even with only 27k it was getting pretty dirty. I didn't go for the 85W MPG crap. Way to expensive. I bought a 5gallon bucket of this stuff and it showed up at my door 3 days later. Much cheaper per quart vs even retail M1, or the gold AC Delco stuff. The main thing is get a quality 75-90 Full Synthetic GL-5 rated gear oil. IF you have the G80 Locker, the friction modifier found in even M1 or other retail bottles is not recommended by EATON. I called and talked directly to their tech guy. He was very clear, no friction modifiers. I was not able to find 75/90 Syn Gl-5 on the shelf locally, and I was doing 4 diffs. 2 on my silverado and 2 on my '89 K5. Worked out perfect. And this stuff is "FE" Fuel Efficient. So it's thin 75/90. The 75/85 is for GM to get .1 more MPG on the CAFE. Toyota uses some thin gear oil also... I use my truck as a truck in industrial construction. .1mpg does not matter, getting 250k does. If I cared about the MPG impact between 75/85 and 75/90 then my E load KO2's are really a no no.

Here you go... G80 happy:

http://www.phillips66lubricants.com/documents/conoco/industrial_oils/FOB%20Triton%20Syngear%20FE%20TDSw%20828151.pdf

Thanks Great info! I am getting this crap for my truck ASAP....I never even thought about the G80 Locker/Eaton requirements! I love the part how this Gear oil can go 500,000 for intervals? Comedy folks!

sdeeter19555 · October 29, 2016

Thanks Great info! I am getting this crap for my truck ASAP....I never even thought about the G80 Locker/Eaton requirements! I love the part how this Gear oil can go 500,000 for intervals? Comedy folks!

Depends on the differential...a lot of OTR trucks have a 500k change interval.

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FL335i · October 29, 2016

mookdoc6 - the 500k interval is for the semi's running on the highway, very common for that application. Not our applications!! That Triton gear oil is marketed toward semi's, hence the 5 gal pails, not being sold at Autozone in quart bottles. The semi's do not have LSD's so their oils do not have friction modifiers normally. Again, for our G80 rear axle, and even front axle being it's open diff, we want a 75w-90 GL-5 FULL SYN gear oil with NO FRICTION MODIFIER. GM put a 75-85syn rear oil in there to get another .1mpg but in the front diff they used cheap 80-90 conventional gear oil. I'm running the 75-90 Triton FE in both front and rear diffs on my silverado and K5 Jimmy.

Z45 · October 29, 2016

AMSOIL makes a similar 75W-90 gear lube available in quarts.

FL335i · October 29, 2016

Look at the OE and API approvals on the Triton FE compare to the Amsoil. Just saying. Price of my 5gal bucket to my door step was $172.00. Came out to $8.60/Qt. I needed a 5 gal bucket for my 2 trucks anyway. I run 0-20 PP from Walmart b/c it's a good oil with the proper API and Dexos approval. I used to run M1 0-40 in my BMW's from walmart for the same reason.... meets specs and is priced right.

Edited October 29, 2016 by FL335i

15_silverado · October 30, 2016

Look at the OE and API approvals on the Triton FE compare to the Amsoil. Just saying. Price of my 5gal bucket to my door step was $172.00. Came out to $8.60/Qt. I needed a 5 gal bucket for my 2 trucks anyway. I run 0-20 PP from Walmart b/c it's a good oil with the proper API and Dexos approval. I used to run M1 0-40 in my BMW's from walmart for the same reason.... meets specs and is priced right.

https://www.redlineoil.com/product.aspx?product=58304

^^^^... I'm looking for something more readily available in quart size; would this be ok to use; does it meet the requirements for the g80???

Also could I use this in the front diff.

Thanks.

Edited October 30, 2016 by 15_silverado