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The oil is dark. That was the first thing I looked for. The heads were pressure tested. And after a couple of valves were lapped, it came back good. But it may have had a bad pressure test at t he shop.

It takes a while to build up pressure, it's not making a mess anywhere. There are no bubbles or foam in the radiator.

It's driving me batty. It will suck the overflow tank dry in 50 miles, but nothing is wet. I've checked the water pump seap holes and shaft seal, they are always dry.

It's like it is evaporating.