So after getting the 66 to start today I was in a great mood. I noticed a leak at the thermostat housing and took it off to replace the seal. And this is what I found. The radiator fluid is army green in color with a little consistency to it. But it does not smell like oil! Is this just because the thermostat wasn't lined up properly? Good news would be nice!!!!

 

Flush it a couple times. That's not a color I've seen before! Drain the oil and see if its got coolant mixed in. Would look kind of like chocolate milk usually. Any idea when the last time was for a coolant flush? Go with the simple stuff first.

 

Hi,
When running, did the engine's exhaust emit any particular smoke color?
BTW, when is the last time your coolant was changed?