I have used both 0w40 and 5w40 Mobil 1 in a 02 Jetta for a long time with great results.
I have used Mobil 1 for years in Volvo diesel cars, and they are known for cylinder wall wear, of course its a VW Audi engine. With using Mobil 1 5w30 over several hundred thousand miles, I have seen zero wear and have not needed to adjust the valves once, in several engines. I am convinced it works well.
I used mobil 1 5w30 when I did the 10K oil change as well.
my v6 consumed almost a quart during the first 3,000 miles then it stopped (zero oil consumption!).
No you aren't a guinea pig. I have been doing extended drain interval for several years now on a chipped 1.8T. I run M1 5W-30 and average 17-20k between oil changes and currently have 200k miles on my '02.
I've always used Mobil1 0W-40 and never had oil-related problems. In fact, my Dad used it exclusively in his 1988 Chevy S-10 pickup and only changed his oil once a year for the life of the truck. Today it's still running strong on the original engine with over 200k miles on it. And that's only changing the oil ONCE A YEAR!
use M1 0w-40 in my girls Beetle S. works like a charm. currently i'm using AMSOIL 5w-40. going to switch to M1 0w-40 after this.
im running 5-30 mobil 1 full syn. ive notice the car is QUIETER with less valve noise, its been 2000 miles so far on the syn oil, and its still clear, lookin got 8-10K outta it...
i use 5w30 in mine and it runs great. really quiet.
i use 0w-40 on my vr6 with 80K miles. runs fine
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