for just about any oil question you have, go the site of bobistheoilguy. read all of his info and then take his test at the end. you'll learn stuff about oil you never thought of. and for anyone living where it gets cold, go with full synthetic. it is better than dino, especially in the cold. this stuff flows like water in july, when it's -20 degrees F outside. takes a huge load off the starter, alternator and battery in the cold.