The 3150's have been pretty reliable. There are some things that have been more expensive to repair than other models though. The MFWD axle is a ZF brand and parts are very expensive if needed. The other thing that comes to mind is the rockshaft. (three point hitch. If seals wear out in the rockshaft, it causes all hydraulics to run slowly and the cab has to be removed to repair. All around, a good tractor though.