Hey guys,

Looking at my service booklet its saying to change the spark plugs approx 40,000kms or so on the W202 C230K engines....why so soon? Its been done and stamped from MB as done from the previous owner at that mileage. I havent done them since I got the car and now it has 100,000kms but its running great!

Why would I need to change them and should i?

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99 C43
98 S420
99 C230K
01 C240

Replacing the plugs at the recommended schedule keeps the engine operating at its optimum, even if it's running well now. Spark plugs are not expensive.

The more important point is that replacement will prevent the plugs from getting seized and causing major problems later.

If you do replace them, use copper-based anti-seize paste on installation.

It is VERY important to use the OE spec plugs. Many owners "upgraded" the plugs and experienced a great deal of grief. MB knew what they were doing when they spec'd a certain plug.

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John Shellenberg
1998 C230 "Black Betty" 240K

http://img31.exs.cx/img31/4050/tophat6.gif

So you can get them out of the head without stripping the threads. With an aluminum head time is probably more important then mileage.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Better do them soon...was planning to now in Jan after the holidays. It will be at a 50,000km interval since the last change.

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99 C43
98 S420
99 C230K
01 C240

I change mine ( same car as yours ) every 50 k km.
Use Bosch F7KTCR plugs.
No need to gap them ( they are triple electrode plugs ).
Use a LITTLE anti-seize on the threads and a LITTLE die-electric grease inside the plugboots.
Blow out the holes where the plugs are BEFORE you remove them.

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2007 C 230 Sport.