Advice vs pros and cons of engine flush

I have used Sea Foam for years as an engine flush prior to changing the oil, never had a problem. I add it to the cold engine and let the motor warm up, slowly rev the engine up (~2500 rpm) and down a few times, then change the oil. I don't drive the motor or place any load on the motor while I have the Sea Foam in the engine. You'll be surprised at how dirty the oil will look when you drain it. I'd try this before you tear down your engine, because you might have a bad lifter. You probably just have a sticky lifter from lack of regular use.