I'm one of many with this problem as well. Switched to Synth (royal purple) since I got her. I lose about 1/2 to 1qt+/- oil every 2500+/- miles.

I do remember a discussion about the Piston Rings being a culprit to our oil problem. Some that have done an engine rebuild noticed that there is a difference with the rings p/n compared to the originals, I guess "revised" would be a better term. After which, they have not had any oil problems.

In my case, I have not gone down that route (rebuild) <knock on wood>, but when I start her up there is a strong smell of burning oil (up until she reaches operating temp.), but no smoke or leaks can be found...