CobraCommander

Weird...I find that I burn oil not leak it...

Samo7

If its still in the bud try Mechanic in a Can perhaps. (Insert brand here).

MP4.2+6.0

No BTW, I have not had a rear seal issue on any modern Audi. I did on a few laughably unreliable 70's C1's, but not since then.

As I recall, some modern Audi motors have been reported with seal issues where the oil vapor system pressurizes excessively and then the seals start to blow out. Thus, a sign to review that system. If you take off your oil cap with the motor running and find a lot of pressure in there, not good. Set up should be sucking it into running motor basically. Even if normal now, if repair history shows anything about the oil vapor system being repaired in the past, there is your likely clue of a cause.

I can't quite see doing it on a modern motor, but on the old tractor (literally) C1 four banger, I would end up putting in motor seal stuff to minimize the leak, since pulling motor or tranny is a ridiculous exercise for a seal. Trouble with those additives is they tend to expand all the seals so can cause greater wear to others with time.

TFT

I have owned 7 Audis since 1985, two of them (1985 Audi 5000 & 1990 V8 Quattro) had over 200,000 miles and none ever had a seal issue.

mishar

This is the best idea. I like chemistry. Especially when it saves a bunch of money.

gedis080

I don't know, was done when previous owner had it.

TFT

Any suggestion as to which "motor seal stuff" I should use? Are there any negative side effects to using this type of product?

MP4.2+6.0

As I said in my prior response to you anticipating this (??), the downside is the product often works (if it does) by expanding seals. Thus for perfectly good seals (like at your cams for example, or your front seal) it is increasing the pressure a bit on the seal to rotating shaft face; might cause greater seal wear over the years but I don't think has ever been studied methodically. There is another type that is more a sort of gunk which is mechanical in nature--sold often in bottles where you see the gunk toward the bottom sitting on the shelf. Would never use that in a motor with precision parts, like the very small hydraulic lifters Audi uses in its valve train. Brands: a variety on the store shelf; hard to know.

Bangerla

Put a couple quarts of regular non synthetic oil in on your next oil change. My W12 was leaking a little oil, and the regular oil will swell the seals a little, and stop the leak. Synthetic is not very good with the seals, which is why you see some of the "high mileage" synthetic has additives to swell the seals.

TFT

I took the car in for the 75,000 mile service, picked it up this past Thursday. It has not leaked a drop since. I just checked the garage floor a few minutes ago and spotless.
I don't know how that could happen. Maybe the oil change had something to do with it.
The previous oil used was synthetic, this was not.