We prefer Amsoil as well here at the shop. We use Amsoil Dominator race oil. Doesn't break down as fast as other off the shelf synthetics. VR1 is also another good oil. We steer clear away from Mob...
Numerous times from different people, (myself included) with having an engine "mysteriously" die of rod knock with the oil clear and level where it should be and Mobil 1 was in it wh...