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..never used synthetic oils; I've never believed in them.........and if you're anal like me and change your oil every 3,000 miles or less it's usless anyways.............DEFINITELY stay away from pennzoil and quaker state; I have seen many engines torn apart that had an inch of sludge in the valley pan and oil pan from using these two oils............I wont use anything but valvoline, castrol GTX, or mobil 1.

66 buick guy
Uhhmmm, last time I checked, Mobil 1 IS a synthetic... :facepalm: Arguably the first of the major mass market synthetic brands, and far as I know that has never changed...

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