Understood, I think my original pump was around 8 minutes to fill the tank from empty with a door open for no interruption ? (correct me if I'm wrong) π€..
Hopefully you've suffered just a tired pumpπ
Most likely burntπ€―
I draw the old oil out with a vacuum pump,
Refill, run the engine while steering left to right fully and continue like that until I'm happy with final color after draining and refilling repeatedly. π
I'd give it a good clean down and check it again after a few miles.
If there has been a leak for a while, the oil will be in every minute place and will slowly ooze with the engines heat. Hopefully you don't have to drop the sumpπ