I use Mobil 1 0w-40 in my car (1.8T) because it is readily available, VW approved, has good performance and a decent price.
Mobile1 Full Syn 15w50 for my VR. I would like to think that if you changed your oil every 3000 miles under normal driving conditions than regular oil would be fine. Since I have some modifications and like to drive it like I stole it--sometimes-- than a better oil is good insurance.
On that note, I currently have tried VW Oil from the dealer, Mobil 1, and Kendall Fully Synthetic and have determined that Mobil 1 5W-30 is the best mass-market oil out there to use. I run it 10,000 miles and the motor is as smooth as ever.
I always get Mobil 1 0w40 ... it's 502.00 and VW approved !
I rebuilt a 1.6TD, my first rebuild about 16 years ago, and it had Mobil 1 15w50 since day one. I sold the car with 550,000 miles on the engine and it was still purring.
Run Mobil 1 and you need nothing else. I change the oil every 10K, at 150K still going as strong as ever.
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.
Same here 0W-40 since new, now have over 140K, runs like a dream.
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.
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.
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