Originally Posted by MACDRIVE
I think you should be going the other direction, 10W-40. I've been using MaxLife 10W-40 since May 04, 2006. I was previously using Chevron Supreme 10W-30 or Castrol GTX 10W-30.
With the 10W-40, I'm getting a smoother engine with less buzz, way better gas milelage, and quicker accelleration. I suspect the reason for that is the MaxLife is actually a synthetic blend, although it is not marketed as such. I chose the Maxlife because it is on the thin side of a 10W-40.
Yes, you'll get 20 more hps and 5 more mpgs going to this oil... whatever! I smell b.*.