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Old 08-20-2002, 10:23 PM
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Join Date: Feb 2002
Location: Seattle WA
Posts: 39
Bosch Spark Plugs

What is the difference, if any, between a H8 DC,
and a H8 DCO Bosch Super spark plug? My '91 190e
2.3 manual suggests the DCO, but some say the DC.
1991 190E 2.3 SOLD
1972 911t 2.4 owned since 4/80 300,000+ miles SOLD
1999 C43
Merlin XLM, All Ti, 17.5lbs.
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Old 08-20-2002, 10:53 PM
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
The "O" indicates a heavy duty electrode. I recomend the "O" series where ever available, regardless of what the original spec called for, so on an older model if it calls for a H8DC, I would recommend the H8DCO. If the "O" plug was not available I would feel fine using the original H8DC though.
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Old 08-21-2002, 02:57 AM
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Join Date: Jun 2001
Location: San Francisco, CA
Posts: 3,096
Gilly Same advice for an '87 190E 2.3?

'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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Old 08-21-2002, 06:47 AM
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Yes, any time there is a Bosch plug available with the identical part number, but with an "O" at the end, use that one with the "O".

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