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Hi. Very easy job. Simply remove the black plastic covers located in the center of the valve covers, remove the individual spark plug coils (8 of them), and change the plugs. Be sure to use some anti-seize on the new plug threads... just a dab, you don't need much.
You'll find many posts here about w140 service manuals. MB will now apparently sell you a CD with basic procedures at the dealers. You can also subscribe to ALLDATA on-line manuals which has more detail. For the most detail, you can buy on-line time with the MB site.
The attached pix shows the plastic covers removed and the plugs coils exposed. This should help you along.
I see this is your first post... you'll learn much about your W140 if you hang around here a bit. Don't hesitate to ask questions... the folks here are terrific and will help you.
Welcome to the best Forum on the web.
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KenP
1996 S500 W140 Coupe
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