Quote Originally Posted by psychos2 View Post
The pistons have 3 rings like any other piston. And the theory about the drain back holes would be ok if all 3.5L engines had the same oil consumption amount. shawn
You may be right about the number of rings, I wasn't sure about that part and was going from memory of a conversation over a year ago. But the change in oil ring drainback holes is the main point and is factual. Whether it is the main cause of oil burning is another question.

I also meant to say there is an oil-burning connection with the EGR system more so than PCV. My old 99 Trooper didn't burn any oil (at least until it got totaled), which I suspected had to do with the Mobil One I used and it's tendency not to gum up the EGR system. But I have no way to prove it.