As an example of how well its new P+4 surface-discharge sparkplugs work, Robert Bosch GmbH says that one with a factory-set gap of 0.062 ins. can replace a conventional plug gapped at 0.028 ins., yet require less input voltage. P+4 plugs require less voltage over time compared with conventional low-cost standard plugs, but when compared with premium aftermarket plugs, including the double-platinum type, the P+4 units deliver more energy, says the company. This is particularly important at ...

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