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I hate to beat a dead horse, and I know a lot of the topics like this one are beat up on this board, but I just saw a half dollar size oil spot on the garage floor. I haven't checked the underside of the engine because its wet and snow around here. Is the consensus to leave it till its bad or take it in. 06 bought in Sept with 3100 mi. oils been changed once by me, motorcraft 15w40.
My '05 sprung a leak at 400 so I figured I better take it in right away (first week I had it). Sprung another leak at 4000. Warranty covered all the work. So unless you need the truck every day, take it in and ask for a loaner. Check the usual spots, front seal, rear seal, glow plugs, etc. Usually the leak is a minor inconvenience only. But it still is a hassle anyway you look at it.