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I changed the spark plugs on my W221 S65 myself for the first time and would appreciate your opinion on the condition of the spark plugs.
They have been in the car for 40 000 km and 4 years. The car runs on a Renntech tune (plus pump upgrade) for 2 years, it is completely stock otherwise.
The spark plug on the top left is closest to the driver for a reference.
Forgot to mention that I drive the car on the Autobahn at high speed 90% of the time. I always use 102 octane fuel. I am not sure whether the engine is slightly running lean based on how the spark plugs look.
08-23-2018, 02:30 AM
