Ive been running 5W-30 redline synthetic oil, Bes oil in the buisness
Have to order it from summit though have not found locally
Vavle train noise decreased drastically. MPG increased by 2 and on top of all the my rear main seal leak nearly completly vanished
http://www.supramania.com/forums/for...amp-Filtration
If you want more info on why its the best check out what jdub and others have to say about it.