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Old 02-27-2002, 07:56 PM
300EVIL's Avatar
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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?
Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320

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Old 02-27-2002, 11:10 PM
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Bosch's German site has the information. Go to 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 02-27-2002, 11:19 PM
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Location: Evansville WI
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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.
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Old 02-27-2002, 11:50 PM
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Just what i wanted to know! Thanks!
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