Best trans oil choice Eric_R_Kissell at
Mon Oct 17 08:59:21 EDT 2005

On Oct 13, 2005, at 5:09 PM, Kevin McCalla wrote:

>> What is the consensus on the proper oil to use for the
>> transmission in the 200tq?  How about the rear end?

<brett at> responded:
>Stock VW/Audi fluid.  Amsoil also makes a GL5 that IS compatible with
>VW, Porsche, and Audi transmissions.

>If you consider any GL5 rated fluid, triple check with the
>manufacturer that it is compatible with VW/Audi transmissions and is
>brass syncro safe.  It used to be that all GL5 fluids were NOT, and
>now several (including Amsoil) are; an additive that was in use to
>help meet GL5 specs would destroy anything brass in very short order.

Excellent point about needing to double check the compatibility of any GL-5
rated oil since GL-5 is not correct for these transmissions.  These older
Audi/VW transmissions need an oil rated as acceptable for brass & copper
corrosion stabilization,  which GL-5 does not give but GL-4 does.  In the
past, AMSOIL had a 75w-90 GL-5 MT-1 rated oil that was acceptable for our
transmissions.  Note that the MT-1 rating is what indicated that Amsoil's
GL-5 oil was acceptable to use in the Audi/VW transmission.  The MT-1
rating includes brass/copper corrosion testing that GL-5 does not.

Amsoil has a new GL-4 rated 75w-90 transmission oil, so the stabilized GL-5
MT-1 is no longer the choice for the VW/Audi transmission.  Use the new
GL-4 rated 75w-90.  AMSOIL told me that the new oil is formulated on the
thin side of the 75w-90 rating, which these transmissions like better.

Note that this oil is listed under the transmission fluid section on the
AMSOIL web site and not the gearcase oil section.  Contact me if you need
help ordering as I buy oil from AMSOIL regularly.

No, I am not a dealer.


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