These air cooled engines like to be ON the full mark. Not above or below. SAE30 oil is cheap. Check the oil on flat ground prior to starting EVERY MOW. Make it a ritual, check oil and add fuel.Lol yes I did. I'm thinking what happened in the first place is overfilled the engine with oil and it backfired/started smoking. Idk though I'm not an expert. Drained all the oil, put in new oil and wiped off all the oil from the motor/exhaust and it stopped smoking after about 30 seconds or so.