I took the oil-filler cap off the camshaft housing while my engine was running and lot of hot air coming out , not oil and some mixure but only hot air ,is that a problem !!!!!!!!!?
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Depending on what type of engine you have, the crankcase may be pressurized to a certain degree. This is so the PCV valve works properly and is not a worry. Most valve covers have a metal shield over the fill tube so that it doesn't splash much, but it still can. -
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