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I know a lot of them are pre-gapped in the factory and surely all plugs work best if the gap is as the plug is designed to work best so why do different engines need a different gap from the same plug.
Actually, the set of Bosh Super Plus I've got to in an uncle's Merc I doubt could be gapped because a gapping tool is more likely to cause damage with the plugs having several earth electrodes.
I once took the plugs out of a Vauxhall Carlton 2.0 and the earth electrodes were melted back to the thread. The car was still running fine.
Actually, the set of Bosh Super Plus I've got to in an uncle's Merc I doubt could be gapped because a gapping tool is more likely to cause damage with the plugs having several earth electrodes.
I once took the plugs out of a Vauxhall Carlton 2.0 and the earth electrodes were melted back to the thread. The car was still running fine.