🔥 Bosch HR9DC Spark Plug - Top Performance for your Vehicle Review

This spark plug is a game-changer. As my tests showed, it performs exceptionally well, improving acceleration and fuel efficiency. It's easy to install and incredibly durable, working flawlessly for an extended period. The only con is its higher price point compared to other spark plugs. Overall, the Bosch HR9DC Super Plus Spark is a reliable and high-quality choice for anyone in need of ignition parts.

Installed on a Mercedes 190E 2.6 and they worked perfectly. This is the OEM for most Mercedes from the late 80's to early 90's. They also arrived quickly.

Works well on my 1986 300E. But I'll probably get hotter plugs if the car is driven short distances. These candles can get dirty. Not that those spark plugs were dirty, but the set that was replaced was badly burned.