It is quite possible it could be from the crankcase ventilation... Usually somewhere between that mileage and 100k is when the V8's are due for intake reseal with rear cover, which is also a good time to do the valley pan since the intake would be off.

If it isn't the crankcase ventilation system it could be either valve guides and/or rings... but that usually isn't a problem.

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RIP 4.6is.....

2003 4.6is