I am somebody who takes pretty good care of my stuff and probably change the oil at a shorter interval than most. My brother-in-law is a different story. I take care of his car, but he is so bad with maint. that he goes nearly a year before I get to work on the car again. Last OCI he put 13 months and about 12K on regular Mobil 1 and it was not pretty coming out. I actually ran the engine with cheap oil for 30 minutes, dumped it (it had turned pretty black) and then re-filled with M1 5W-30. What do you think of putting in M1 0W-40 since his maint. is so bad? We are on long island, so we do have cold winters, and he does have a lot of short trips because his work is 5mi. from home.