Off the wall idea here. I used oven cleaner with great results when cleaning the carbon build up on my valves. Do you think it would help as an oil additive to keep carbon from building up ? Or maybe spray some in there a day before you change your old oil. Or just play it safe and use Sea Foam.

Oven cleaner will actaully etch aluminium - I doubt you want it in your engine.

 

GD

peepl and their quick fix ideas. oil goes in there.