After doing research on the best oil for a vw 2.0L engine, I think synthetic is the way to go in this engine. Need some help deciding which oil is best for the 2.0 that can do the full 10,000 miles. So I have come up with these oils. Castrol Syntec 0W-30 Mobil 1 0W-40 Valvoline Synpower 5W-40 Shell Rotella 5W-40 If there is another good oil please suggest. I like this car and plan to be keeping it. By the way this car does about 6000 miles a year. Its a '02 VW Jetta GLS 2.0 and it doesn't consume a whole lot of oil about 1 quart in 2000 miles. Also once I start using synthetic, should I switch back to regular at 100,000 miles or keep using it till ovehaul. Thanks.