Toyota Prius / Audi / Mercedes-Benz Iridium Spark Plug VKH20 5618 Ignition System Upgrade

Is your vehicle experiencing idle shakiness, weak acceleration, rising fuel consumption, or engine misfire? These symptoms often indicate aging or carbon buildup on the original spark plugs, resulting in insufficient ignition energy. This iridium spark plug provides stable, strong ignition to ensure complete fuel burn, restoring smooth power and fuel economy. Compatible with Toyota Prius, Audi, Mercedes-Benz and other post-2000 models; part number 5618/VKH20. During installation, tighten to the 26.5mm seating length with torque 25-30 Nm to avoid damaging the head or causing leaks from over-tightening or under-tightening.