buddy i went from alexandria la to jax fla only stopping for gas, then went thru to tennessee and up 81 to honesdale pa on the 5w30 i had changed when i left. that was 2231 miles when i got there, changed the oil and looked just fine. drove around pa for a month then got to tn and changed the oil about 100 overdue (wasnt watching my odometer like i should have) again looked good. when i got back to la i drove another month and changed it when i should have and that 3.0 ran like a champ the whole way, just had the pesky check engine light due to elevation change but went away shortly. besides smoking/cracking the rotors on 471 in tn (8 miles of 10 mph switchbacks up and down the mountain 3 times) going up to pa then coming down it w/ the same rotors just thought to put the a4ld in 1 and coast down the mountain using minimal brakes i had no problems the whole time. use the 530 or 520 like what the trk calls for and youll have no problems i can assure you, no need to go thicker even in hot weather. after all, i live in la, 102 degree heat some days in aug w/ 100 percent humidity driving the heat index to 125. 530 pennzoil is what my dad used for years and i switched to castrol gtx, did great til the oil pump died and smoked 3 cylinders at 280k. now to rebuild bigger and badder, again will be using 530 but a full syn once breakin is reached.