though this might be a waste of a post, i just want some opinions from all you out there. i have a 99 35th anniversary edition with a procharger. i am currently getting a t&j longblock with stage 2.5 head porting along with his new cam. ive always used conventional oil in the car, and now with the new motor going in, i was wondering if i should stay with conventional or go to a synthetic. i should be pushing around 550-600hp, with that in mind what oil do you recommend and what weight? thanks guys!!