[LakeCleElum]

When stored for long periods, it not unusual for oil to seep into the cylinders and then out into the exhaust; even filling the muffler....You made matters worse by putting in the six quarts with draining the old oil. To properly check the oil level, the engine must be completely warmed up and idling on a level surface. So, it was seriously overfilled when you added 6 qts.

If it was mine, I would drain the engine and oil tank and start with 8 quarts. Before starting, I would pull the muffler and drain any in it. I would put in fresh plugs and realize it's gonna smoke like a crop duster until all that oil burns out of the exhaust....G'luck.