First of all I am sorry to start a new thread on this subject, but I have waded through a swamp of information and cannot find a clear answer.

So then, since Bosch has discontinued the H9DC and the H9DC0 non resistor plugs — what is the correct plug for the 300E W124 M103? If it matters more I have an 86 300E and 92 300TE.

Thanks!

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David
1986 300E Anthracite + ECodes + MB Mileage Award

I was able to obtain the H9DC0 plugs from ebay.co.uk

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Tom 2010 C250 4-matic Sport (Canada)

Click on "buy parts" at the top of the screen.

Mercedesshop only carries the resistor plugs

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David
1986 300E Anthracite + ECodes + MB Mileage Award

The NGK BP5EFS appears to be an equivalent plug. Also, there is a Beru plug, I think the part number is 14 K-9 DU (Z81).

The NGK plug you'll have to look for it on eBay, possibly in the UK. The Beru plug can be ordered from kingsborne.com.

What does the little " Note" H9 DC mean?
http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1XC0ZKQX921W13TR0D&year=1986&make=MB&model=300-E-002&category=F&part=Spark+Plug

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2007 C 230 Sport.

not clear but many members have stated the get the R plug, and Bosch website says the same. I have read many posts on this subject.

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David
1986 300E Anthracite + ECodes + MB Mileage Award

Have you talked to Phil lately?
Maybe he found a source for non-resistor plugs.

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2007 C 230 Sport.

closing soon on ebay 20 h9dc0 non-resistor plugs for $10 excluding postage.
http://cgi.ebay.com/20-x-BOSCH-SUPER-H9DC0-SPARK-PLUGS-JOB-LOT-2-x-10-BOXES_W0QQitemZ170096427195QQcategoryZ40019QQrdZ1QQssPageNameZWD2VQQcmdZViewItem

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Tom 2010 C250 4-matic Sport (Canada)

Check the new forum Fastlane Specials. Here are the plugs:

http://catalog.peachparts.com/item.wws?mfr=TYS%3AOES&qty=1&sku=0031590403&cookieID=21212820H21215NSLW&source=www.peachparts.com&clientid=catalog.mercedesshop

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1992 400E current
1988 300E sold
1973 280C totalled
1973 280SEL never got it running
1971 250C my first love but rusted out

The original premise of the question was wrong - both plugs are still widely available.

Hi,

can the resistor type HR9DC be safely used without the risk of damaging the engine?

Thanks!

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE

They won't damage your engine, but you may experience some idling/driveability issues.

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2007 C 230 Sport.