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I was a Mercedes mechanic. I have a 1998 E320 wagon and changed the plugs according to the schedule on page 33, Spark Plug Intervals, in the Service Booklet: At aproximately every 100,000 miles or 4 years. There are 12 of them, they are platinum and cost about $150. It took me a couple of hours and I found it easier to remove the coils also.

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17y ago

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