correct juice?

[timofej.crift at att.net]

GL-4 for the trans, GL-5 for the Rear Diff.

Tim
> 
> 
> Subject: Re: correct juice to use in diff of '88 90q?
> 
> >I just replaced mine with Mobil 1 75w90 GL5 synth oil.
> 
> I thought that GL-4 was the correct stuff, being formulated for the
> bronze/brass (?) synchros.  I think it is for the Redline, and that the
> GL-5 causes problems.
> Is it any different for the Mobil-1?
> Should the GL-5 be flushed and replaced?
> Mark
> 
> 
> 
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