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Old 02-27-2001, 11:20 AM
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Mike Murrell Mike Murrell is offline
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Join Date: Feb 2000
Posts: 2,359
88-91 300-SELs use a Bosch H9DC or H9DC0 plug. Std. setting is .032; however, there are some on this list who believe a better idle is attainable using a slightly wider gap. I haven't experimented with widening the gap yet.

The H9DC0 plugs have a slightly wider side electrode and in my opinion, last a little longer than H9DCs.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
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