What is your choice for rear end fluid
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Joined: Aug 2002
Posts: 2,325
From: BC
Re: What is your choice for rear end fluid
Went to GM top pick up some Gear Oil and they had the 80W90 fluid. But when reading the fine print on the back it says its GL-4 Compliant, not GL-5! Which is what the manual specs out for Limited Slip Differentials (Gl-5). They asked a mechanic and said that "thats what we use for them, along with a bottle of the additive".
The parts guy then said the additive makes the "GL-4" a "GL-5"
Can anyone confirm this? Why wouldn't it ask for GL-4 with additive ininstead in the manual rather then GL-5 w/ additive?
The parts guy then said the additive makes the "GL-4" a "GL-5"
Can anyone confirm this? Why wouldn't it ask for GL-4 with additive ininstead in the manual rather then GL-5 w/ additive?
Registered User
Joined: Dec 2000
Posts: 1,320
From: Alta Loma, CA
Re: What is your choice for rear end fluid
Originally Posted by WOT
I've used both redline and mobil 1, no pinion seal leaks ever. Synthetics not being good for performance is myth. 
Not to mention Redline shockproof is probably the best climbing gear oil there out there.
Not to mention Redline shockproof is probably the best climbing gear oil there out there.However, just because synthetic may not be the best in this application, doesn't mean anyone said it wasn't for anything else. I use Royal Purple in the engine and trans still (even though most people say to use dino on A4s also).
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dbusch22
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Oct 31, 2016 11:09 AM