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Does the oil on your dipstick resemble that, or just your oil cap? If its just the cap, its really nothing to worry about. That's condensation mixing with the oil, most likely due to a few too many short duration trips without letting the vehicle warm up to full operating temperature.
Do you live only a couple of miles or so from work/school by chance?
Just in the cap and in the top of the filler neck. I don't live close to work though, but I'm sure I am guilty of a few trips to the gas station or store with out fully warming the truck up. Hopefully that's the issue. Truck runs fine. Thanks.
the 5.4 3v motor loves to condense water from the atmosphere. and short trips don't get the motor hot enough to burn that water off and get sucked out the motor via the PCV
just wipe it out, and try to avoid those short trips...especially in the colder weather
Yeah, it's just where the moistue in the air over the warming oil / internals condenses against the cooler under surfaces of things like caps and valve / cam covers and mixes with oil mist. Thoroughly warming the engine warms those surfaces as well. It ain't all your oil.
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