Glad to hear you are back on the road! When the oil is dropped out, there is still more than 3/4 of a quart trapped in the engine between the clutch, gears and other hiding places. When I pulled my '81 engine, we dropped the oil, left the plug out, cranked the engine with the starter and another 1/2 quart came out. Dropped the engine out and while on it's side....another 1/2 quart came out! So it is not surprising that there is still coolant in the trapped oil! Spinning the engine with the plug out will get a lot of it out.