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Well, the 20w 50 was also synthetic, and I have been running synthetic since I bought the car in 1999 with 182k miles. Fixing the PVC setup and replacing the cam, valve cover, and oil cap seals also were necessary to stop the leaks. The car still uses about 1 quart over 1000miles or so, but I think most of it has to do with turbo use, 206k miles and any small leaks I dont notice.
I ahve heard that leaks can get worse with synthetic, but I have also heard that synthetic does a good job of keeping the seals swelled up, so i guess there is a few different opinions out there. The nice thing about a synthetic with a N\A engine would be longer drain intervals. I have tried several brands, and I prefer the Amsoil 10w40, and the Castrol 10w30. I have also heard that once you choose a brand, it is best to stick with that one.
My leaks were usually turbo related (before it was replaced) or related to clogged PCV system.
Good luck,
Zack
Silver 83' 242Ti
PS: When you first switch to synthetic, it will clean out your engine pretty well, so change out the first batch at 3000miles or so. I can open my valve cover now after 20k miles use of synthetic and it looks brand new. Very minimal leftover deposits. I have to replace the oil pan soon, so I'll check to see what the inside of that looks like.
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