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As you might know, if you've been inside a greasy mechanic's repair shop, every engine transmission part coming out of an engine or transmission is covered with itk!
A rich black greasy coating covers ever part.
If you think about it...
You can see, if you think about it, how that tar-like coating gum's up engine parts - and the tough job of cleaning involved by your mechanic.
That goop is the end result of sticky piston rings allowing combustion to slip pass the top of your piston. We call it blowby!
The picture shows the pistons and valves dirty and clean as a before and after treatment by something I call the engine valve treatment - that frees and cleans such - the tapping just goes away - and the engine runs geeat again!