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This article is from the Ducatis Motorcycles FAQ, by Duke Robillard duke@io.com with numerous contributions by others.

12. "I pulled my plugs recently and while the tips were dry and dark withthe porcelain a brownish color, both had this oily film on the threads.Should I be worried?"

Probably not. This can happen from time to time on bikes (cars, too) with
no oil consumption at all. Many Ducati owners have noticed this phenomenon,
and it doesn't seem to correlate to any problem areas. As long as the
electrodes and the insulators look good, you can postulate a more realistic
picture of the health of the engine.

 

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motorcycle, vehicle, Ducatis, servicing, oil, motor, parts