The cylinders are horizontal. Oil will seep into the cylinder behind the piston if it is over filled or parked on an incline. Lower the oil level to halfway between add and full to check if it helps.
SAE30 is about the best oil you can run if it smokes. A multi weight or synthetic will smoke way more.
SAE30 is about the best oil you can run if it smokes. A multi weight or synthetic will smoke way more.