those other signs? oil slick, black carbon, contamination of the coolant,
signs of combustion byproducts in the fluid. not acceptable.
spark plugs, signs. green plugs.? or someother wierd color.
id have a compression tester on it so fast..... ( 4cylinders,,,, what are the nums?)
cap ,just look the seal, is is flat and smooth, not split down the side.
look for physical damage to the cap. it is a very crude machanical device.
it has a vacuum breaker device inside too, look for damage there.
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