Date registered: Feb 2007
Vehicle: 03 E320 4M Wagon & 97 E320
Mentioned: 0 Post(s)
Quoted: 10 Post(s)
I just want to point out three things.
1) If you use a good oil, synthetic or not, of the correct viscosity and change it 4000 - 7000 miles, depending on your driving, your engine will outlast many other major components of your car. You will get rid of the car not because of oil-related engine failure. The poor MB gaskets of the M103, and 104 engines, however, are different stories.
2) To cmitch. I have no doubt that Royal Purple is a better oil than many others but I am not going to use it. How do I know it is good? I work at a university where we have a heavy equipment program. The faculty there use Royal Purple and they have all kinds of testing equipment. Most drive diesel pickup trucks. One has a Dodge truck that has over 400k miles on it and he only changes his oil every 20k miles or 1 year, with Royal Purple. I won't use it because what I said in 1) and this is also expensive and not easy to find.
3) To Diesel Benz. This test is actually very similar to the 4-ball wearing test, an industrial standard test. Yes, grease and EP gear oil would perform better but Mobil 1 0W-40 was not against grease and gear oil. It was against motor oils hat also meet the very same requirements. It is an extreme test so everything has wear. However, how much wear under what load is important.
From what I read, Mobil 1 used to publish this industrial standard data on their oil's specs like Amsoil and Redline. However they stopped doing it and said it was not relevant. The coincidence is that Mobil 1 was beaten by Amsoil and Redline on this particular test.