Urgent Gear oil question

Bernie Benz b.benz at charter.net
Thu Feb 14 07:38:58 PST 2008

A lot of disputable speculation on your part, Brett.

Further, auto spec sheets differentiate between the final drive gear  
ratio and the tranny ratios in those specific terms. Picky, picky,  


On Feb 14, 2008, at 7:14 AM, Brett Dikeman wrote:

> 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.
>> 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.
> Brett

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