I have a MF 50 a Tractor Backhoe loader the engine has?? over 4000

hours, runs good. Bought with no mechanical history.

What can I expect to get life-wise out of this engine before a overhaul?

Leaks out if the front crank seal, replaced two years ago, leaks again.

Other then that runs good, Filter sensitive, poor power is filters moderately

dirty. Mike