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Some things are due because of the time element, spark plugs, believe it or not ARE one of these. MB calls for replacement every 100,000 miles or 4 years, so they are correct. In 2000 they upped it to 100,000 or 5 years, either way you're due.
They aren't terribly hard to replace, not a "walk in the park" either, kind of in the middle. Hardest part is properly removing the plug wires from the plugs, and also not alot of clearance on the rear cylinders especially.
Gilly
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