The owners manual on the 1999 ML 430 specifies a Bosch Spark Plug F8 DPER. This plug number is not available in the aftermarket and has no cross reference. Many other aftermarket plugs are available. I conclude this its a "dealer only" plug. Anybody know what's special about it? I don't believe in cutting corners.

Thank you--Jim Herold

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Jim Herold--Current: 1987 190E 16V, 1999 ML 430--Past: 1971 280 SL, 1972 250