1992 500sl. I have been adjusting the fuekl mixture and the rough idle has disappeared.
Can I find out if it's too lean by the color of the spark plu electrode after a few miles? white, brown, black, ash color being what I'm looking for I guess.

The DYI information is pretty complex and I adjusted the mixture to the place wher the engine was running smoothest, I'm concerned about running too lean and causing damage to the engine. opinions please.

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Thanks, Juan