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re: 4K trans/diff fill
>GL5 is currently recommended by Audi, since its a "step above" GL4.
>also used by the military, hence the
>"Mil-Spec" equivalent. You cant go wrong using the GL5.
>Basically you will have more protection than you will need!
>In my CGT I run 145W/90 GL5. Why?
>The differential bearings suffer excessive wear with 90W.
>Bearings go, ring and pinion soon to follow!
>Use a 2 foot plastic tube to fill gearbox. Mik
GL-5 for rear differential, GL-4 for transmission/center differential
(common case) GL-5 is not backwards compatible, it is not intended as a
replacement for GL-4 oil. Which is appropiate depends on the design and
materials of the transmission. I had an '86 Subaru once that used GL-5
in the transmission, my '86 5KTQ uses GL-4, I think Audi still specs
GL-4 for manual transmission in new cars. Audi does spec GL-5 for the
rear diff because GL-5 is better in high pressure, hypoid applications,
the additives that make this possible also make it more corrosive to
things like soft-metal synchros, not the stuff you want in a manual
transmission (unless the manufacturer designed it this way, alternative
synchro material, etc.) It's not a matter of "better," it's what is
appropiate for the application. If GL-5 was a "step above" GL-4 then I
don't think Audi (and many other makes) would spec GL-4 for their
transmissions, especially since GL-5 isn't exactly a new specification,
it's been around for a while. Check with the oil manufacturers
recommendations, most are rather explicit in not putting GL-5 in a
spec'd GL-4 application.
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