Quote:
Originally Posted by s13_sr20det
smells like oil. im dong a compression test tomorrow to see what pressure its holding. i just don't understand why it only happens once in a while. Never when i start the car. only after driving it or letting it idle for a good 20 min
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The metal expands as it heats....this could maybe bring out leaks once the car warms up....also, the coolant pressure goes up as it heats up, making it more likely to force it's way through a small leak.