If an engine is finished black, WD40, CRC, etc can pretty it up. Don't spray it on the engine though, spray it on a cloth and wipe the engine. If you use too much it can cook on.
For a new black engine, CRC and others make a similar product that contains teflon which would be better because it prevents stuff sticking to the engine. These are more expensive and harder to find though, and you should definitely keep that away from the brakes.
There is a grey blur, and a green blur. I try to stay on the grey one. - Joey Dunlop
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