I have a MF 510 combine and a 760 combine. Never have had any Massey tractors, seems like they sell for really cheap compared to other brands. Maybe it's the Perkins engines in the older ones that brings the value downIJ
I have always heard good reports on Perkins engines. They are easy on fuel and easy to start in cold weather. The only repair I have done to a Perkins engine is a rebuilt water pump on a 73. The next repair will be a tappet cover gasket that is starting to seep. Tom in MN