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Message: <blockquote data-quote="Johnny O" data-source="post: 567594" data-attributes="member: 61743"><p>Frams are weak inside.  If you MUST get a Fram, get a ToughGard.  I had been using Mobil 1 in my old truck changed every 5k, but my UOA from the lab on Motorcraft oil at 5k looked just as good.  I just got a UOA from my dad's Cadillac running Mobil 1 Extended Performance for 11,200 miles and it looked fine (note that newer Caddy's hold 7.5 quarts too).  I'd say plain Mobil 1 should be good for 10k if you keep it topped up, but I'd get a UOA to be sure.</p></blockquote><p></p>