re: transmission leak --question

["Matt Martinsen" <mattmartinsen@hotmail.com>]

>Is it possible that the changover from OEM oil to Redline MT-90 (GL-4
>synthetic) has caused a seal to leak? I've heard that seal shrinkage 
>(and
>leaks) will often happen when *engine* oil is changed from "dino" to 
>synth,
>so...anyone have this happen with transmission seals when a new fluid
>(Redline?) is added?

The original G50 oil in the transmission is a synthetic so I wouldn't 
think that putting in the Redline MT90 would damage/shrink the seals 
like putting changing over to sythetic in an engine.  Besides, it seems 
to me like the transmission seals wouldn't gunk up like engine seals 
because there aren't any introduced contaminants like in an engine from 
combustion byproducts.  I changed to Redline MT90 (GL-4) in the 
transmission and Redline 75/90 GL-5 in the rear differential about 9 
months ago immediately after I got me car and haven't had any leaks.  
Audi says it's not necessary to change them, but I figured my car was 
approaching 13 yrs old and it might be a good idea.  One question I have 
is that Blau sells Castrol 75/90 synthetic gear oil which they say is 
for both the trans and rear diff.  This is an API GL-5 oil, Audi specs 
GL-4 for the transmission.  I thought that a GL-5 oil in a GL-4 trans 
would hasten the trans demise, especially to the syncros, because the 
high pressure requirements create a much more corrosive oil.  I for one 
would _never_ put GL-5 oil in my GL-4 trans.
-Matt Martinsen
-86 5KTQ I.A. 1.5

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