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which plugs for 87 300E? H9DC or H9DCO?

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04-04-2002, 11:51 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?
Thanks.

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