I would start by running a cleaner through the motor. I believe some have used sea foam. If that does not work I would try eliminating the pcv valve. I had an issue with consumption and stopped it by eliminating the pcv valve. Take the hose off the pcv valve and plug the end. Get a piece of hose to go on the pcv valve and put a breather in the other end. I got one from the auto parts store for $10. shawn