Urgent Gear oil question

John S. Lagnese jlagnese at massed.net
Mon Feb 18 18:45:49 PST 2008

----- Original Message ----- 
From: "Brett Dikeman" <brett at cloud9.net>
To: "Bernie Benz" <b.benz at charter.net>
Cc: "John S. Lagnese" <jlagnese at massed.net>; "200q20V mailing list" 
<200q20v at audifans.com>
Sent: Thursday, February 14, 2008 10:14 AM
Subject: Re: Urgent Gear oil question

On Feb 13, 2008, at 10:20 PM, Bernie Benz wrote:

> Don’t use GL-5 in the gear box, use GL-4. GL5 won’t harm the gears

SOME GL-5 fluids are compatible.  Some are not because they contain
additives used to get the GL5 rating which are not compatible with
brass. Consult with the manufacturer and specifically ask if it is
compatible with VW/Audi transmissions.  Mobil 1, Amsoil, and others
have hotlines specifically for compatibility/application questions.
Several have email addresses as well.

>  but will result in slow shifting, as it is designed for hypoid
> gearing requirements, the final drive systems.

GL4/5 are different performance standards, and while GL5 fluids are (I
think) always hypoid compatible, so are many GL-4 oils.  You're also
not using the term "final drive" properly; final drive refers to the
halfshafts and wheels, not the rear differential or transmission.

> Before you top up with GL-4, add a bottle of snake oil, engine oil  stop 
> leak, to the tranny
> to eliminaate and stop future rotary shaft seal leaks.

The most common seal leak is the passenger front side output shaft
seal, and it's because of heat from the exhaust downpipe.  Stopleak
won't fix a seal that is damaged from heat exposure or aging.  It may
stop the leak temporarily, but emphasis is on "temporarily." It's all
the more likely to cause a more significant or sudden failure later
on, which would be both very expensive and very hazardous if it
happens at speed.
How difficult is this repair? Is it better done by a shop? When I added gear 
oil it dripped out from the passenger side axle somewhere.
> On Feb 13, 2008, at 6:55 PM, John S. Lagnese wrote:
>> I am low on gear oil. The Bentley is of no use as usual.

The Bentley does in fact list the oil specs for both transmission and
rear differential.

>>  What do I need in my 5 speed gearbox for my 91 200 20V Quattro?

The simple answer: get the Audi fluid from the dealer, or if you need
to save some $, get it from Clair Parts Express or similar dealer
wholesale source.


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