I can't seem to find any mobil1 0w-40 anywhere. Does anybody know wher to get some other than bmw, mercedes, dealerships on the east coast? Looking at the viscocity numbers at 100C it seems like what I am looking for. Since 10W-30 M1 is 9.8, I think 0W-40 will pretty much eliminate the slight oil consumption with its viscocity around 11.4 or something. Well at least I hope so. I could even mix 1.25 qts of 0w-40 with 3 qts of 10w-30 to average out to 10.88, which is slightly higher than castrol GTX 10w-30. I just figure this is the number to aim for since when I used just castrol I didn't consume any oil between oil changed. I hope to find some soon as I need to change it out sometime. Thanks....