Engine oil Mobil or Castrol
i switched from castrol syntec 5w40 to mobil 1 0w40 when i went turbo and i noticed faster spool up and 9 degrees colder oil temps during hard drivin.....
Mobil 1 0W-40 can be had at your local walmart. It's quite a bit cheaper at walmart than the auto parts store.
the info is correct. I find the Castrol and Mobil 1 most consistently at Autozone. The Castrol is called Edge now, I think.
I have an mk4 2.0 Jetta with 87.000 Kms (54.000 miles aprox) and when I bought it it came with 20W50 Quacker State oil in it... I knew it was not correct so I change it with Castrol Edge Synthetic oil... The guy at the shop told me that since VW engines run on high temps the recommend grade was 5w50... So far the oil has been great... There is zero oil consumption, the engine runs smooth and the temps are stable...
Just completed my first hands-on oil change on the GTI; used the German 0W-30 Edge, since VW still owes me one more filter and Castrol oil change in a few months.
technically you can use Mobil 1 Euro Formula 0w40 in the GTI and the Phaeton because it has the VW502.00 certification.
I was able to document that the oil was VW 502 certified Mobil 1 0W-40.
I do my changes @10k with UOA. 2nd change was with 4 laps on the Nurburgring and about 1500 miles @125 MPH. At 10k The report came back that everything was fine and the oil still had life in it. With my K04 it came back fine also. I drive the piss out of my car.
A definite 'no' on that. VW says no and it's been shown many times. The factory fill is plain old off the shelf oil (generally Castrol).
Have my best experience with Castrol 0W30 (European $8.99/qt) Minimal lifter noise and run it 5k between changes. Also, use OEM oil filters.
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