I think part of it is marketing.. I think we are all somewhat suckers for that.. I am.. I love Mobil 1. I still have a jug of the old Ultra 5w20 I am going to use for my spring/summer oil change. I decided to do 2 oil changes a year... hopefully I dont get bored and change it out early LOL. Oddly enough, I wouldnt consider anything besides Pennzoil or Mobil.. I dont know why, but I wouldnt buy any other brands.. Im closed minded I guess lol
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