Engine, Transmission, and
Differential Lubricants
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The Audi Quattro 20V Home
Maintenace & Consumables
Engine, Tranny, & Diff. Lubricants
Engine Oil
Filters
Tranmission & Differential Fluids
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Engine Oil
Everybody's got their favorite brand of oil, so I won't even try to tell
you what to use. I also won't get into the synthetic vs. dino debate. The
most important thing is that you change the oil and filter regularly. System
capacity is 5 quarts.
 The drain
plug is 26mm x 1.5 thread, and the washer is 26mm ID x 31mm OD x 2mm thick.
I had trouble getting the correct size from parts places, so I bought an
oil drain valve. It makes this job much cleaner and easier. Thanks to Chi
Wong, I now have the source for these valves. Go to
http://www.fumotovalve.com for
information and ordering. The 20V engine uses P/N T207.
If you'd like to replace the stock plug, proper plugs are available from
C.G.
Enterprises (see #1042 or #1043). They also can supply the crush washers
(#2058).
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Filters
I don't want to get into the filter debate either, so let me just say that
I use the OEM Mahle brand. For a good comparison of oil filters check out
this oil
filter study and
german
oil filter study. The original P/N for our cars (Audi 056 115 561 G,
Mahle OC-47) has been discontinued. The replacement (Audi 034 115 561 A,
Mahle OC-154) is the same filter that is specced for the turbo cars,
so it's probably a little better. They're not too expensive (~$3.00 ea.)
if you buy a case of 10 mail order from
German Parts and Restorations
(800-321-5432), Halsey Imports (800-792-0081), or Impex (800-736-3550), to
name a few. There are other good brands out there, so take your pick. Just
make sure that they have the anti-drainback valve and the bypass valve.
Transmission & Differential
Fluids
The owner's manual states that the transmission and differential fluids never
need to be replaced. However, many owners (myself included) report good results
from replacing them with fluids from
Redline, but I'm sure there are other
suitable brands. Smoother shifting, (hopefully) longer life, and even slightly
better gas mileage are the rewards.
Transmission/Front Differential
Synthetic GL-4 75W/90 oil is shared by the transmission, front diff., and
the TORSEN center diff. Redline MT90 is the replacement of choice. The
system has a three quart capacity. DO NOT use GL-5 oil in the tranny!!! This
includes products from Mobil-1 and Castrol (Syntec), since as far as I can
tell, they don't offer a GL-4 variety.
Rear Differential
The rear differential takes 0.8 quart of synthetic GL-5 hypoid oil, which
corresponds to Redline's 75W90. Low fluid and oil presence on the side of
the differential case can be a sign of bad seals.
Tips
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You'll need a 17mm hex-key socket for the drain and fill plugs. Many foreign
parts places will carry these because VW and Porsche trannys use them
as well.
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Always make sure you open the fill plug before draining. If it has seized
and you drain the fluid, you're in trouble!
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A suction gun comes in very handy for getting the new fluid in.
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