Currently I’m thinking since oil in the coolant and not in reverse, it’s gotta be at a high pressure point such as the cooler. It also may explain as the engine heats up it seems to “push” the coolant out, because it’s putting pressure in the coolant system? It shouldn’t overheat though. That I’m thinking is separate. I can replace the thermostat and water pump, I already have a new water pump on the shelf. Right now shipping prices seemed to be jacked up, $50 of gaskets that can be mailed in an envelope rockauto is saying $25 shipping. Yea, no.