<VV> Tranny/diff fluid levels

[Kirby Smith]

Sorry for the late response, I'm hundreds of emails behind.

My crazy idea started with Audi's prohibitions, supported by some tech 
rep at Redline.  But here is an overview link:

http://www.sbcc.ca/tech/lube1.htm

And the second footnote on this page says it all

http://oil-store.com/OilStore/Gear%20Oil%20Nutshell.htm

As noted in the first link, the sulfer compounds in modern hypoid EP 
oils are likely safe at their recommended temperature, whatever that 
might be relative to a particular application.  I believe I used Redline 
MT-1 to avoid this possible problem when I replaced the transaxle fluid 
in my S6.  I don't remember what I filled my Corvair transaxle with 20 
years ago.  Since it hasn't been warm since then, I'm not yet worried.  :)

kirby

BobHelt at aol.com wrote:
> In a message dated 7/26/05 8:01:26 AM US Mountain Standard Time, 
> kirbyasmith at gwi.net writes:
> 
>> With respect to diff oil.  Modern 8Xw90 differential oils are usually
>> GL5.  This stuff has sulfer compounds that eat brass syncros when the
>> oil is very hot.  If your oil never gets hot, then no sweat.
> 
> 
> 
> Kirby,
> Where did you ever get this crazy idea? It's just not true that GL-5 
> will eat brass synchros. GL-5 may not have the same protection as GL-4, 
> but since most GL-5s are also rated MT-1, they do have adequate synchro 
> protection.
> 
> Regards,
> Bob Helt