Thread: Spark plug question
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Old 05-30-2001, 08:14 PM
Mike Murrell's Avatar
Mike Murrell Mike Murrell is offline
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I'll reference a different Bosch plug; however, the naming scheme is similar.

M103 motors use H9DC or H9DCO

The plugs with the "O" on the end have a slightly wider side electrode. It's been my experience that H9DCO plugs last a little longer than H9DC plugs.
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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