I was definitely wrong, starter is on the left side as psfred said. I do recall that one time I did an oil and filter change on my M103 and experienced a massive leak. Really more like a dam breaking. I fired it up and drove off only to see the oil pressure guage descend to zero. I pulled over and shut it off.

Had it towed home. Turned out that the rubber seal on the filter had warped and didn't seal. Put on a new filter and all was well.

Steve