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Old 03-16-2003, 12:32 PM
pmckechnie pmckechnie is offline
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Join Date: Jan 2003
Location: Matthews, NC
Posts: 1,355
Just my $0.02 worth. I just tried the plat w9dp plugs in my 84 500SEL and it was a big mistake. Ran terrible. With no other changes, put in NGK BP5ES (?) plugs and the car runs great again.
I don't know about the +4 but I don't think I will try them. The w9dc or w9dco or the NGK work so why take a chance again.

84 500 SEL (307,xxx miles)
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