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replacing spark plugs

  1. C900 Workshop
    So I'm replacing my spark plugs and I have been told its really important to get the right ones. The Bentley says NGK BCP7EV or NGK BCP7ES The only has BCPR7ES11 (I'm assuming they are NGK's) or BCP6ES has NGK BCP7EVX for 1984-1993 Turbo 16 Valves but they have...