problem is the lifters. i have same sound on my 4.6. Ironically my 1991 has 200,000 miles on it and has never made this sound. anyway, i did a bit of research, this sound is probably coming from one maybe two lifters. it makes your truck sound sligtly like a diesel, right? i do not believe though that its causing any immediate harm - at least that was what i was told. others may correct me. i have been advised to try a slighly lower viscosity oil on my next oil change and not to muck with it until some other issue necessitates engine work.
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Pat Herman
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