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Old 03-01-2002, 07:02 PM
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Mike Murrell Mike Murrell is offline
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Join Date: Feb 2000
Posts: 2,357

The Bosch H9DC/H9DCO plugs that your engine uses are relatively inexpensive. I change mine annually, irregardless of mileage. Plug condition is somewhat an indicator of what's going on inside your engine. An annual change gives you an opportunity to see how things are.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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