I bought these spark plugs to replace the factory spark plugs in my Benz. After driving almost 70,000, my car hesitated a bit before starting. After installing these spark plugs, my car started faster (without hesitation) and more consistently. My S550 purrs like a kitten. Mercedes uses BOSCH or NGK spark plugs as OE, but why pay double just to have a small Mercedes Tri-Star badge on the spark plug. It's the same part! Highly recommended!
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