i have always ran amsoil synthetic in my '08. Never burned a drop of oil and never had an issue with blowing oil into the plenum. I have the YFZ catch can setup with Todd's "michael" fitting just in case. My neighbor has an '08 also with a stock motor that spits oil all the time and burns oil also. We have done some experimenting with different types of oil and have seen different results as far as burning oil. We are currently using a 10-40 non-synthetic oil and it has greatly reduced his oil consumption. I can't remember the brand of oil we settled on, but tried a few different brands of non-synthetic before we settled on this setup. works great now!