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Old 05-30-2001, 07:14 PM
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Mike Murrell Mike Murrell is offline
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Join Date: Feb 2000
Posts: 2,359
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.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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