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Old 05-31-2001, 02:28 PM
Arthur Dalton Arthur Dalton is offline
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
Originally posted by Mike Murrell
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.
Just found the Bosch letter designation chart.
Letter "0" designates: "Special insulator/electrode."
Does not mention what's so special about it, but that's it.
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