Engine oil Mobil or AMSOIL

I will also use a zero weight synthetic like mobil one.

Amsoil 10-30 was my choice on my 200,000 mile 2001 jetta + i changed @ 10,000 usually 4 to 6 months. car was chipped etc, about 300 tq + 275 TQ with a KO-4 + APR tune etc.

AMS oil 5w40 "European Formula" after first 5k. Just dumped the first oil after 10k of hard driving. Still had lot's of life left in the oil, and no noticeable consumption as we recovered almost all of what was originally put in (4.4 of 4.5L)

For what it's worth I run Amsoil 20-50 in both holes on my 01 sporty 1200, never had any issues.

AMSOIL is good stuff, but it's expensive.

I just switched to Mobil 1 for the last interval and the engine ran much better on it.

I used 5w40 Mobil 1 Full Synthetic in my 08 Passat. Had such great results, I carried it over to my 12 R Line.

In my last four VWs I've run the Amsoil 5w40 Euro Spec oil and think it is good stuff. My 1.8t engines in my old Passats ran really quiet with this oil. I changed the oil in my GTi at 2500 miles and switched to the Amsoil and have had no complaints. I'd recommend Amsoil.

I did my 1.8T AWP valve cover gasket two weeks ago and I can highly recommend Mobil1 0/40. Used it since 3/2002.

Mobil 1 10w30 with a bosch filter up here in Canada. Haven't had a tick since I started using it, at 110k km my engine is in good shape to begin with though.