MY 6036 HAS GOT A JOHNDEERE MOTOR IN IT AND WON'T START. I HAVE TRY NEW STARTERS,BATTERYS, FUEL PUMP REPAIR.MADE NEW BATTERY CALBES, ADDED A 2ND BATTERY.NOTHING HAS HELP, WHEN YOU GET IT RUNNING ITS STARTS FINE. I AM WONDERING 5W-40 SYSTEC OIL WILL HELP OR IF YOU HAVE ANY ORTHER IDEALS