I have replaced my Perkins 4-108 and Borg Warner Velvet Drive transmission with a new Perkins M65 in our Mason 43. The engine and tranny are running take outs with all the accessories. We wanted more power as our boat weighs in at about fifteen tons. Both the engine and the transmission leak a bit of oil at the front engine seal and the rear transmission seal. But new seals are cheaper than new engines. The engine appears to burn little or no oil. We are asking $2500 for the pair.