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Old 02-27-2002, 08:56 PM
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Spark Plug Question

I am currently running Bosch copper "H9DC" plugs in my 300E. last time i changed them they replaced the "H9DCO" that i had in there. my question is.... what does the "O" stand for?? whats the difference?
Thanks,
Adam
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Old 02-28-2002, 12:10 AM
pfphipps
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Bosch's German site has the information. Go to http://www.bosch.de/aa/en/produkte/zuendung/zuendkerzenkunde/ and click on "Bosch spark plug type designation key". It gives a very complicated chart. Some things are pretty clear, others are a little more obscure.
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Old 02-28-2002, 12:19 AM
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"O" is for a heavy duty center electrode, i recommend using the plug with the "O" on the end whenever it's available.
Gilly
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Old 02-28-2002, 12:50 AM
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Just what i wanted to know! Thanks!
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