Stop in for a cup of coffee

Rainy Day Auto said

So I guess rust under the oil cap is normal??

1995 Ford ranger with a 4.0 155k miles

I took the cap off to do an oil change and it's rusty and mushy looking. The rest of the engine compartment looks flawless and clean

The truck runs like an absolute top with no known issues

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My wife's 06 Charger with 5.7 liter Hemi has a problem with sludge under the oil filler cap. It happens mostly during wintertime and when driving in the city for too long with no long trips. But, the filler tube is made of plastic I think, the cap too. But, the sludge is obviously formed by oil and water. When we drive the car on a long trip at higher speed, the sludge goes away and it is totally clear again. Just a thin film of clean oil.
If the engine had a steel filler tube I am 100% sure it would have been rusted. So, I would think the car is driven a lot on short trips. But, I am not going to be surprised if you tell me it is driven on long trips only, because there is no rules without an exception. :D

Bill