[200q20v] Trans and Diff oils

[C1J1Miller at aol.com]

Scott Mockry's site says this:
"Using a good synthetic lubricant in the Quattro transaxle (Manual 
Transmssion/front differential) and in the rear differential is recommended. 
This synthetic fluid improves cold weather shifting tremendously and Audi 
supplied the 5000TQ with synthetic transmission fluid from the factory. 
Redline MT-90 which is a 75W90 GL-4 rated synthetic is a good choice in the 
transaxle.

There was a change in the filler plug location on the 016 type Quattro 
transmissions. Beginning in 9/13/88 the filler hole was raised 15mm and the 
capacity increased to 2.75 qts. and the transmission is full when the oil 
level is 7mm below the lower edge of the filler plug. However, during 
repairs, the transmission can be filled up to the bottom of the filler plug 
hole and this would correspond to filling it with 3.4 qts.

Some VW and Audi enthusiasts use the Redline MTL (75W/80W) GL-4 synthetic 
transmission oil but I don't recommend this lighter weight oil in the Audi 
transaxles with Hypoid ring gear. The front wheel drive VW transmissions use 
a different differential gear arrangement than the Audis due to the 
transverse mounting of the transmission in the VW. The Redline     75W90 
Synthetic Gear Oil is recommended in the Quattro rear differential. Go to the 
Redline Oil  Web page for more details... http://www.redlineoil.com/

I recommend changing the transmission fluid every 30-40k miles, even if you 
are using synthetic fluid, the brass from the synchro wear tends to stay 
suspended in the oil. Changing the fluid every 2-3 years can improve the 
shift quality and remove the metal in the oil."

http://www.sjmautotechnik.com/trans.html

That's what I'd do...
Chris Miller, Windham NH, c1j1miller at aol.com