Thanks for the good recommendations, guys. I just purchased four quarts of the stuff and will use it at my next oil change instead of my usual Mobil1 tri-synthetic. I'll still be using my trusty Mobil1 oil filter though. I don't know for sure if it makes a difference but it does give me that "warm and fuzzy" feeling to use it instead of a cheapo or even OEM filter. I'll let ya know how I like the new oil.