I have two 35hp efi 2015 one with 828hrs and one with 841hrs. One shucked the cam two days ago and the other did head gasket and cracked block. They say the fins were plugged and overheated the motor. I clean blow the motors out daily. Have the cover off 40 hours ago and there was hardly anything under them. Needless to say Kohler is not standing behind them. So I'm looking at spending $8,500. Not happy.