5W30 synthetic is supposed to be worth 5 HP at like, 5000 RPM or something.
I never ran synthetices ever. Just gold old Castrol GTX 10W30... And I was fairly hard on the car, but just kept up on oil changes.
I never ran synthetices ever. Just gold old Castrol GTX 10W30... And I was fairly hard on the car, but just kept up on oil changes.