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Message: <blockquote data-quote="swoop1156" data-source="post: 21253" data-attributes="member: 580">I'm torn on this and making the switch.  Allow me to tell you a story...A long time ago, we had a Ford Explorer.  We ran what the factory recommended at that time, whatever it was.  Something happened in the engine and the engine had to be replaced under warranty.  They sampled the oil to be sure that it was "within specs" for amount and type.Fast forward to now-a-days.  I was talking to my service adviser buddy and he stated that if there is any engine trouble that requires parts or whatever to be replaced, the first thing they do is check the oil for amount and type.  He said that to be on the safe side -- run the factory 5w-20 Synthetic Blend from Motorcraft (sure, it could have been some BS marketing ploy) or possibly work could be voided on the engine for warranty.I'll definitely take the time to research this before I come back in here and say more, but I just wanted to share my experience and what I've been told.  I am sure that there is something in writing about this someplace.Please discuss.</blockquote>