Genuine Mercedes wires are the best, and the most expensive. They will last you at least 5 years. Bosch is ok, but will only last half as long.

I use Ngk spark plugs. Some people use champion. It doesn't really matter as long as they are non resistor plugs, and you change them every year, or 16,000 miles.

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2