What is the sound of one piston slapping?
What is the sound of one piston slapping?
Illustration for article titled Excuse me?

I’m watching an old episode of Wheeler Dealers where they work on a mid ‘70s 911. The owner of one was telling Mike what to look out for, like if you pull off the oil cap and see white stuff, meaning a blown head gasket. Really? I always thought that that white gunk was a mixture of oil and coolant, so he’s saying that the mixture of air and oil will make the same mess? I’ve never heard that before, although I will admit that I don’t have enough experience with air cooled cars to know what the oil looks like when you have a blown head gasket.

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