I was told this motor is a 1958. Elgin 12 serial #962 2395, 12 BHP @ 4,000 RPM, model 571 58962 Sears Robuck and Co. It also has 73708 cast onto it. Can anyone verify that? Also should I run grease -or- 90 weight oil in the lower end? It had oil... well kind of. I have torn it apart and the...