I know this ahs been discussed to death, so please forgive me but a search did not come up with what I am looking for......... It seems that the most favored dino oils on this forum are 1. Pennzoil with Purebase 2. Castrol GTX I know, I know there are many other good oils..but is this correct? and why is this the case.........is there a poll somewhere that I can look up for favorite dino oils ??