I runn amsoil's european car formula 5w40 full synthetic and being a mechanic i will vouch for amsoil all the way because i can always tell the difference between good oil and ****
I use Castrol Syntec 5w40 502 here is the list of common oils for N.A.
I've kept using GTX in my Passat and just recently had warranty work done (cam adjusters, valve cover gaskets etc.)...dealer honored the warranty and I got no feedback that my engine was "sludged up due to non syn oil"..so I'm stick with it!
I went 10k on amsoil 5w40 and never needed to add oil.
In any event, I switched to the Castrol Syntec 5w/40 on a free oil change given by my dealer at the 14,795 mile mark during an "oil consumption test". I'm happy to report that I have traveled exactly 6,000 miles om the Castrol 5w/40 and have not added any oil to my "R". Currently, I am down a half quart on the dipstick.
To that statement you should also add German made Castrol Syntec 0W-30, an oil that not only meets the 502.00 oil spec, but the far more stringent 503.01 spec as well.
I use the Amsoil 5W-40 european formula. It was not on the VW oil list last time I checked, but the Amsoil says right on the bottle "meets VW spec 502.00" so I'm cool with that. Amsoil has a great reputation.
I've topped off with Castrol Syntec 5/40. The cap says Castrol on it and the manual says to use VW approved synthetic 5/40 so I figure I can't do better than that.
Cost...$9 for filter online, $1/QT for Castrol GTX with rebate...so $15 or so...knowing that everythings done right..priceless!
You probably don't \"need\" syn, but its a darn good idea, esp if you want to run 5000k ocis with urban driving and/or want to keep the car for a long time. If you do stick, with conventional, which i don't recommend, make sure its better stuff like Castrol GTX.
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