Not my car...but an auto related restoration.

norshorblufish said
I believe and correct me if I'm wrong. The tank was filled with motor oil and it has a crank which operates a pump that pumps the oil up to the tube to fill an oil can with a spout to pour into your motor.

Yep, that's what it does. I have one I got years ago that I still need to restore. Was looking at it today and noticed the dipstick went missing.