Castrol 0W30 Made in germany, or as it is best known "German castrol." It is "thick" 0W30 more going toward 0W40. It is thermaly very stable oil. I used it on Passat B5.5 1.8T (2005) and there is more then obvius difference between "GC" and regular Castrol 5W40. GC so far is the best I used it.
Anyway, when I had my Passat 1.8T and sludge issues were the big fad, my oil of choice was Valvoline Synpower 5w40. It met 502 and was not a synthetic blend but rather a real synthetic.
I've used 0W40 Mobil 1 Full Synthetic from the beginning. I have Blackstone Labs constantly analyze my oil. It started with several 5k mile analysis and then I upped it to every 7.5k miles. The oil analysis came back very healthy on all 5k and 7.5k mile analysis, and led me to up it once more to every 10k oil change interval which it will remain. I use the larger Passat 1.8T oil filter. The engine has almost 170k miles on it and still running strong.
Mobil 1 0W-40, never lost a drop of oil with 72,000 miles APR Stage 2
Thus far (only 10,000 miles into the game), I have been rather surprised that I have not had to add a drop of oil yet to my 2010 2.0 TSI. Drove with the DSG in Sport mode during break-in (in an effort to keep the revs up a bit, and encourage more range in the shift points), drained the factory fill at 1400 miles, and have been using Motul 8100 X-cess 5W40 since then (changed out at 6,000 and 10,000 miles).
I took my car to the dealer to drain the factory fill oil at 1400 miles and have Motul 8100 X-cess 5W40 oil added, they also did "Updated software level, performed 24R9 Recall"
After a vigorous break-in and draining the factory fill oil at 1409 miles, added Motul 8100 X-cess 5W40 and then drove on a 5000 mile vacation from Wisconsin to the Pacific Northwest and back.
I switched to Mobil 1 0w40 european formula in hopes of better protection and less consumption. I have 51500 kms right now. I will check mine every 1500km this next oil change.
Anyway, my W8 has been fed only Castrol LL 2 & 3 (SLX, Professional Powerflow) & Shell Ultra Helix VX (Longlife 3 oil made for VW) . I don't know if that's the magic that has made my cam tensioners last this far, but I'm going to heed that mechanics advice in the future too.
I used mobile one 0w40 but burned oil so I filled it up again idk might be cause of the heat or of course the motor which would be normal, but I usually aim at chaning the oil every 8k or half miles on my 2.0t TFSI engine and now I'm using 5w40 motul for my up coming oil change
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