[s-cars] G50 is GL-5 or GL-4 and Amsol in tranny

[Tom Green]

On Monday, July 21, 2003, Vincent gets more help:

Subject: RE: [s-cars] G50 is GL-5 or GL-4 and Amsoil in tranny
> Date: Mon, 21 Jul 2003 10:17:51 -0700
> From: "Trevor Frank" <tfrank at symyx.com>
> To: =?iso-8859-1?Q?Vincent_Fr=E9geac?= <vfregeac at sympatico.ca>,
> 	"'S-Car-List (E-mail)" <s-car-list at audifans.com>
>
>
> GL-5 is bad for syncro's in most cars. I have talked to a few oil
> guy's and=
>  they told me that often people will put GL-5 into there cars thinking
> it i=
> s an improvement.  It doesn't provide to right properties, too
> slippery for=
>  the syncro's, this will lead to premature ware and most likely issues
> with=
>  cold/warm weather shifting.  Especially in the heavily loaded gears
> like 1=
> st and 2nd.
>
> I used to repair old vw/porsche transmissions and had many syncro's to
> repl=
> ace when GL-5 type oils came out.
>
>
>
> -----Original Message-----
> From: Vincent Fr=E9geac [mailto:vfregeac at sympatico.ca]
> Sent: Saturday, July 19, 2003 7:49 AM
> To: ''S-Car-List (E-mail)'
> Subject: [s-cars] G50 is GL-5 or GL-4 and Amsoil in tranny
>
>
> Anyone knows if the the Audi G50 for our tranny is a GL-5 or a GL-4?
> My mec=
> h filled the tranny and the diff with 75W90 GL-5. It should be OK for
> the d=
> iff as the Redline recommended oil for the diff is also a 75W90 GL-5.
> But I=
> 'm scared for the tranny as the GL-5 was said to make the synchro slip
> on t=
> he 90Q20V which could lead to serious damage to the gear. Is it the
> same wi=
> th the 01E? Should I change it asap? The gear are still shifting OK,
> at lea=
> st as well as with the 125Kmiles old oil but I would have expected
> smoother=
>  shifting with the new oil.
>
> BTW, have anyone tried the Amsoil 75W90 GL-4 MIL-L 2105 in the tranny?
> This=
>  oil is readily available when I have to wait may be a week for
> Redline MTL.
>
>
>
> Vincent
> '96 //S6

Don't miss the diff problem created with the change.  The diff calls
for 90W GL5, not the lighter 75W90, so it is filled with underspec
lubricant.

For the tranny, any of the synthetic 75W90 GL4 lubes should be ok.
They all seem to have different qualities depending on the user, and
thus YMMV.   Amsoil and Redline have advocates that claim they were
poured directly from the holy grail.  YMMV.  How the lube works in your
transmission in your location with your type driving is the only sure
way to know which is best for you.

If your syncros are too slippery, you will sure know it since they
won't sync and the wear will come from you meshing the gear teeth.

Although modern chemistry is producing a GL5 spec synthetic lube
without the corrosive properties of the sulphur additives on yellow
metals, the safe course is GL4, if it works.

Tom '95 S6