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There's the off-chance that it's just condensation, too. I've been fooled before. It's not uncommon to see the milky white stuff appear when the temperatures change rapidly.
When you ran your compression test, did you have all the plugs out? Did you hear a hissing noise at any point (blown head gasket between two cylinders)? Maybe it's just wishful thinking for you, but I say to hold off on the panic until you can rule out other possibilities.
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