I use mobil 1 0w40 and it makes a big difference
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Finland
0w - 40 Mobile 1 was all I used for over 3 years, and the R was flawless until I sold her.
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.
I have used Mobil-1 filters for years. Best filter out there IMHO. Well, they recently (within the last year or so) redisgned the can and labeling. The new lable has a pictogram of a full filter with a circle with a line through it. I was like Since I've filled the filter for 16 years, I decided to call the 800 number and ask WTF? So the guy says that they changed their recommendation based on the fact that modern filters have bypass valves and filling it is pointless. I pressured him on it, and he said that filling it wont hurt, so do it if you like.
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