I used Amsoil in my old Mk4 GTI VR6 and in my R32 with no issues.
Pros: no issues
Vehicle:
Volkswagen
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I use castrol
When I bought my (new) 2002 Jetta, I did quite a bit of research on the various synthetic oils for turbo diesel engines. I came away the most impressed with Mobil Delvac-1 in the SILVER jug. The numbers that were available online seemed to suggest that this was one of the better choices. I've run Delvac-1 since my Jetta's first oil change. Not the cheapest synthetic out there, but I've been happy with what I've seen.
Pros: one of the better choices, happy with what I've seen
Cons: not the cheapest synthetic
Vehicle:
Volkswagen Jetta
The 75K miles was tested on Motul 300V on stock internals equipped with a GT28R at the time. Prior to that I was using Motul 8100 5W-40 which I also liked
Pros: liked Motul 8100 5W-40
For some odd reason it seems that mobil 1 iron numbers are a bit higher in the 1.8T. I switched to Castrol Syntec 0w-30 and my iron numbers went down.
Pros: iron numbers went down
Cons: fuel dilution went up
pentosin/pentosynth 5W40 here, changed it 1K miles ago (second run on this oil), great stuff ecstuning.com sell it for ~28 bucks for 5 liter. I like it much, much more over the castrol from dealership (used that too and after 2K miles changed back to pentsynth). I'm very happy with it.
Pros: great stuff, very happy
Cons: castrol not as good
Mileage: 1000 km
Same here 0W-40 since new, now have over 140K, runs like a dream.
Pros: runs like a dream
Vehicle:
Volkswagen
Mileage: 140000 km
Mine's had Mobile 1 since day 1. Up until 45K-ish it was 5w- or 10w-40(?) Anyway, I switched to 0w-40 and I know my milage is a tad better and I swear the seat of my pants tells me the engine has more... spunk.
Pros: better mileage, more engine spunk
Vehicle:
Volkswagen Jetta
Mileage: 45000 km
0w-40 weight oil is great for the VR6. I've been using either Mobil 1 or AMS European Formula (5w-40) in mine since day 1. 85k miles later it still runs like a champ. AMS Euro oil is fantastic stuff, definitly worth every penny.
Pros: runs like a champ, fantastic stuff
Vehicle:
Volkswagen
Mileage: 85000 km
0w-40 is a great oil for the VR6. It's not too thin. At operating temp, it's a 40-weight oil and viscosity-wise is no different than 5w-40 or 10w-40. It is thinner than these oils at start-up, which isn't a bad thing. I used 0w-40 for many miles without any issues and the engine is still in amazing shape at 211k+ miles. FYI, 0w-40 is used as factory fill in all Mercedes AMG engines. If it's not too thin for those beasts, then it's not too thin for a VR.
Pros: great oil, no issues, engine amazing shape
Vehicle:
Volkswagen
Mileage: 211000 km
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