I'll be changing the oil in my Chrysler in the next few weeks (and doing a UOA on the German Castrol), and I'm giving some serious thought to trying Mobil 1 0w20. This oil has got my curiosity up, and I'm interested to see how it would do. Chrysler recommends 10w30 (conventional) for the 3.5 HO in my 300M, but I'm convinced that Mobil 1 0w20 would offer just as good (and probably better) protection as any conventional 10w30. I'll go on record now and predict that this grade of Mobil 1 is going to prove to be the most shear stable Mobil 1 sold, BTW. (We sometimes forget that when Mobil 1 was introduced, it was a 5w20—and that was back when 5w30 was unheard of and people thought 10w40 was the only way to go, and Shell had a 10w50 on the market.) What do you guys think? Do you foresee any problems running a 0w20 in my Chrysler?