What grade of Mobil 1 for my crazy climate?

[cary]

Mobil 1 Truck & SUV 5W40 is actually Delvac 1 and is much better than regular Mobil 1 oil... Better additives and higher tolerance.

It does not appear that Mobil 1 SUV 5w-40 is Delvac. It is showing lower levels of additive package and many now agree it is a different formulation. BTW, on Bobistheoilguy there is a UOA of my Toyota Landcruiser with 8000 miles on 0w-40 and another guys Landcruiser with the same motor and 5,000 miles on the SUV 5w-40 and my wear numbers were much lower.

http://theoildrop.server101.com/ubb/...=001903#000000

http://theoildrop.server101.com/ubb/...=001765#000000

http://theoildrop.server101.com/ubb/...=001262#000000


Here is the SUV 5w-40 and 0w-40 in the same vehicle, note the shorter mileage the SUV oil was run.

http://theoildrop.server101.com/cgi/...=001810#000000


Finally, the 5w-40 has much worse cold pumping numbers than the 0w-40. If you live where you are starting the car in colder than -10f weather, stay with the 0w-40.

[Tiger]

Two different engines is like apple to orange. All I am saying is that Mobil 1 said M1 SUV is Delvac 1. I believe it is a marketing thing to bring Delvac to mainstream because many user complained how difficult it is to get their Delvac.

Mercedes does not recommend using Mobil 1 OW40 on diesel engine because it did not pass their test. M1 is not designed for diesel engine. Only the M1 SUV 5W40 specifically said for diesel and gas engine.

Diesel engine is rougher on oil than gas engine because of all those soot.

[cary]

Mobil has given conflicting information about the M1 SUV 5w-40. Also, remember that HDEO oils have higher levels of things like Zinc that kill the Cat converters than a standard engine oil. While I think M1 5w-40 is a good oil, in this case, the 0w-40 having A3, BMW LL-98/01, MB 229.1/.3/.5 is more appropriate. Finally, for all the talk, I have seen more good UOA's of the 0w-40 than the 5w-40.

Finally, the three UOA's are for the same engine design. While it is not as good as a comparative test using the same engine (which I also posted), they are generally accepted as a good baseline.