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I agree completely. I've seen many posts that recommend changing them every 80,000 miles or so. Also only Motorcraft. I put a remanufactured 4.0 in my 2006, I bought it with an exploded motor (timing chain failure) and the new motor rattled at idle with new aftermarket tensioners. I swapped them...

Thanks for support

Great, I'll give that a try first. I might also mention that the first bad engine I got from my motor guy had a bad leak in the back of the engine as well. Perhaps not cleaning divots out on the upper pan is standard practice of his.

The Mountaineer is AWD. Should I also inspect the rear main. What is best scenario takling this situation. Drop trans, drop front diff or pull engine? The upper pan makes this more complicated doesn't it, or can I attempt upper pan with engine in vehicle?

Hey y'all, My '06 Mountaineer has a refurbished 4.0. This is the second one from my motor guy (the first had a rod knock) and it runs good. Bad news is a pretty heavy oil leak on the back of the engine bellhousing area. It's too much to live with. It leaks it seems mostly while parked not...

Have used this forum almost exclusively for tips and direction in replacing the engine myself and in understanding the chain tensioning system of the 4.0. Hi and thanks to all for valuable info.