I bought my 2003 supercab 4.0L last october at 93k. I am the 3rd or 4th owner. The truck is in amazing shape and it drives like a dream. My friend has the same exact truck since it was new with about 40k less and he thinks that mine drives better than his and all he's done to his is general maintenance. He's been putting Mobil 1 in his since it was new and he's had no leaks or problems. The guy who I bought mine from changed it when he got with conventional but who really knows what was in it before that. My ranger was once listed as a fleet vehicle and whoever first owned it put 55k on it in 3 years. After that 2 other people had it and when I bought it I got a deal on it because it was a repo so I think it sat around for awhile. I think this well for one it was a repo (the guy had a lien on it) and because when I first got it it hesitated when I'd take off and sometimes slow down but not anymore, maybe because there was air in the wire or something. Ok so my question finally is.....Seeing though I can get 5 quarts of Mobil 1 high mileage 5w30 for 5 bucks a quart is it a bad idea to go with this type of mobil 1 synthetic? I mean really I could put the motorcraft blend in or this for 5 bucks more. Thoughts??