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Just bought a 69' 351w that has been sitting outside for a few years. I changed the oil and when I was pouring the new oil in I noticed a milky brown substance in both breathers. I checked the old oil but saw no signs of water, in fact it was very black. The previous owner did tell me that the engine didn't have a thermostat in and he gave me a new one to install. I did a so research via google and found a few people saying this could be normal in humid climates and engines that have sat in the elements for a while. They also said this was compounded by the fact that without a thermostat the engine could not get hot enough to "burn off the moisture". Armed with this info, I go into Summit Racing (BTW - Pretty awesome place to be able to drive to for parts). I talked to a few guys at the counter who totally rejected the theory of moisture. They suggested I drain the new oil, pressurize the radiator and look for coolant to drain out. They sold me a $90 device to pressurize the system and sent me on my way. Questions for the forum: 1. Should I totally drop the theory of moisture? 2. Is there a better way to go about testing this problem? 3. If this is indeed the direct to take I would really like to save the $90 and rig up a radiator cap hooked up to my air compressor and pressurize the system that way. Or should I just stick with the $90 tool that I'll probably just use once? 4. Any other things to watch out for. Thanks:helpsmilie: