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Old 04-04-2002, 10:51 AM
lizem100 lizem100 is offline
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Join Date: Apr 2001
Location: fort worth
Posts: 363
which plugs for 87 300E? H9DC or H9DCO?

I have 15K miles on my plugs and will change them soon. I usually put Bosch H9DCs in but a while back I thought someone noted H9DCOs were better/heavy duty. Are they better and do they cost more?
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