Truth, Its a much debated topic. Local testing has shown M1 0W40 to hold up the best.
I use 502/505 Mobil-1 0W-40 in my 2012 VW 2.0T, and my 2010 Audi 3.0T. I change every 3000 miles.
I just changed the oil with 2,960 on the odometer. This is the car's first oil change. Used zero oil since new. New Mann filter and Motul 5-40. Can't prove it but I swear it runs better.
Mobil 1 Turbo Diesel Truck 5w40 has a more stout additive package and has lower sulphated ash which means less intake valve buildup
Use good oil, Liqui-Moly 5W-40, or Mobil 1 0W-40 "European Car Formula".
Initially I used Mobil 1 0w-40 for the first few oil changes... Engine Idle was sort of noisy for a car that had less than 50k miles. What made me switch was when I opened up my oil cap on 2 different occasion to see smoke come out. After that I switched to Motul. With motul the power deliver was more smooth, less aggressive. Engine idle was quieter. The car felt slower but the engine overall seemed healthier. Most importantly i havn't exxperince smoke after opening the oil cap since switching over.
I use extended performance full synthetic - mobil 1. No problems so far.
Currently running mobil 1 MXT4 in my 2002 vstrom 1000. Holy fuck is it overpriced, but it's cheap insurance. Zero oil consumption despite cruising the highways at 140-150 Kph, @6000rpm.
It might be due to a difference in oil viscosity. With usage the Motul oil has sheared down to 30 weight which makes the engine run more freely and cooler as compared to fresh Castrol which has not accumulated enough hours to lose viscosity. It's been well documented that a viscosity decrease lowers oil temperature.
No oil consumption within a 10k kms interval. So far so good Driven hard for my first 5000 Km's then dumped the factory oil. Been using Mobil 1 0w40 as I have in my past two GTI's. Drove it hard and haven't let off since.
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