So Mobil 1 is my base line oil. I do know they make a decent 0-20 and 0-30. But what if Mobil 1 was not a option? Amsoil makes a 0w30 but nothing in a 0w-20. GC is a another great product but it more viscous closer to a 40 weight. I'm looking for a nice 0-20 or a thiner 0-30 as a alternative to M1.