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  #1  
Old 08-20-2002, 11:23 PM
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Join Date: Feb 2002
Location: Seattle WA
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Bosch Spark Plugs

Hello,
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.
Thanks,
Randal
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  #2  
Old 08-20-2002, 11:53 PM
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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.
Gilly
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Old 08-21-2002, 03:57 AM
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Gilly Same advice for an '87 190E 2.3?

Jeff
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  #4  
Old 08-21-2002, 07:47 AM
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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".

Gilly
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