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Re: Redline Gear Oil - Help I'm Confused

Mark Pollan wrote:

> Please help, I am totally confused by all the various Redline
> products.
> All I want to do is change the oil in my differential and transmission
> (5spd).  The car is an '86 5KCSTQ.
> >From an unnamed vendor (don't want to give him a bum rap because of
> my ignorance I first received Manual Transmission-Manual Transaxle
> Lubricant of the 75W/80W GL-4 variety.  Placed a call saying it was
> the wrong stuff and specified 75W90 gear oil.  Promptly received High
> Performance Gear Oil of the 75W90 GL-5 variety.

You were sent the wrong oil. a GL-5 is for the rear diff. The front
takes a synthetic  GL-4.The GL-5 oil will damage the syncros in the
transmission. And should not ever be used.

> Bentley says 75W90 GL-4.  How do I refer to the right stuff or am I
> missing something?  The trans and diff use the same oil right?

The Audi part is G50 synthetic. Redline is MT-90. they can not be used
in the rear diff.

> Your help is greatly appreciated.  I don't want to make an oh so
> costly
> mistake with the gearbox/diff.
> Mark Pollan, '86 5KCSTQ 228K Miles which I want slippery but not too
> slippery.

1990 QC