The spark wire terminal at the plug is easily damaged during spark plug service. There's a special tool - when used properly - that removes the boot by pulling on the boot right over the terminal clip. It also helps to coat the inside of the boot with a thin layer of silicone (dielectric) grease to facilitate future spark plug service.

Considering the improvements in automotive design over the decades, spark wire terminals one design weakness that should be addressed by the manufacturers. We shouldn't have to deal with this type of problem anymore.

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95 E320 Cabriolet, 159K