Bosch 0242129522 VR8SII30X Iridium Spark Plug:

This is a Bosch Iridium spark plug engineered for use in gasoline engines where reliable ignition performance is required. It features an iridium firing pin at the center electrode, which provides a durable and precise spark for efficient combustion. Bosch designed this plug to meet Original Equipment (OE) quality standards, meaning it matches fit, form, and function of many factory-installed plugs used by automakers. Iridium’s high melting point and fine-wire construction help deliver better ignitability, longer service life, and stable performance compared with traditional spark plugs. Also pre-gapped at the factory, installation is straightforward without needing manual gap adjustment.


Bosch 0242129529 VR8SII33X Double Iridium Spark Plug:

This is a Bosch Double Iridium spark plug, which takes the iridium technology a step further by using iridium alloy on both the center electrode and the ground electrode. This double-iridium construction aims to increase durability, enhance spark efficiency, and deliver a longer operational life than standard single-iridium plugs. Developed to the same high standards as Bosch’s original equipment components, it is engineered for high performance in a wide range of petrol engines. Like other OE-grade plugs, it comes pre-gapped for easy installation and helps ensure consistent combustion, improved throttle response, and reliable start-up performance.