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
Put in 4.0 US Qts. of 0W-40 Mobil 1 (extra due to larger filter). Started the car briefly to check for leaks. Based on my measurement, with the new larger filter, 4.0 quarts will bring you to about 60% up the crosshatching on the dipstick. So, I added another 1/4 quart (8 oz) and that seemed to bring it right to the top. So, 4.25 quarts is what I will be going with in the future.
To bad Walmart stopped stocking Mobil Delvac1. $32 + tax for 4L of full synthetic. Probably one of the best, if not the best oil for Pre PD TDI's...
I bought a case of Delvac1 5W40(4x4L) Synthetic at a distributor not too long ago for $128 tax included. On a side note, it was cheaper to buy the Delvac1 than the Mobil 0W40!
As for oil, I suggest using Mobil 1 0w40. They recently started carrying this in town and my mpg has improved with it.
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