As you probably realize, this is one of those 'controversial' subjects on this board.
I have had excellent results with Bosch +4s on a wide variety of vehicles.
As a bonus, they do not need to be gapped, nor do they lose their gap over time.
They also seem to stay cleaner than standard plugs, even on known 'oil burners'.

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1986 300E 5-Speed 240k mi.