Sawmill Engine Restart & Blue Smoke Observation

What happens here

After refilling with fresh oil, the operator attempts to restart the sawmill engine. The engine starts but immediately begins blowing significant blue smoke from the exhaust. Blue smoke typically indicates burning oil, which could be a result of residual gasoline in the combustion chambers or seals, or more serious engine damage from the previous contamination. The operator notes that the engine sounds much better than before but is still concerned about the blue smoke. He confirms that the engine's oil level is correct after the refill. He shuts off the fuel supply to the engine, allowing it to run until it starves of fuel, which is a common method to clear residual fuel from the system or to stop an engine in an emergency. The engine eventually shuts down, but the severity of the blue smoke persists. The operator speculates that the engine might be ruined due to the gasoline contamination.

Goal: Restart sawmill engine and observe its operation after oil change.