Why Change Spark Plugs at 46.5K/4 Years? - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 06-12-2019, 10:07 AM Thread Starter
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Why Change Spark Plugs at 46.5K/4 Years?

Did I read that wrong? The SM asks for this as "Additional Maintenance Work." It does not make sense. Regular cars are usually at 60K, newer cars 100K, and usually not dependent on time.

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post #2 of 5 (permalink) Old 06-13-2019, 03:04 PM
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My book tells me for my ML to do it at 45,000 miles. When that comes I will wait until 60,000. I can see on the AMG model because it is a performance car but a non performance car it makes no sense to me.

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post #3 of 5 (permalink) Old 07-07-2019, 07:47 AM
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GM makes 500-750 hp engines that have 100,000 mile plug change intervals. Surely, MB should be able to do so too. They just don't, for whatever reason.
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post #4 of 5 (permalink) Old 07-07-2019, 07:57 AM
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Most of the time the plug doesn't wear out to a point where the engine performance is affected.

The reason for changing the plug is because with time the plug can seize in the head because of dissimilar metals.
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Most of the time the plug doesn't wear out to a point where the engine performance is affected.

The reason for changing the plug is because with time the plug can seize in the head because of dissimilar metals.
That's true, but my 2001 E430 has a 100K interval and my 2005 ML has a 90K change interval. Why would the SL require 1/2 the mileage?

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