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.