WR78 Spark Plug

The Bosch WR78 is a suppressed spark plug, identified by part number 0242232504. This premium-quality plug is part of Bosch's "Super 4" line and features a nickel center electrode with a copper core, combined with four ground electrodes for extended durability. Its specifications include a 0.9mm electrode gap, a 14 x 1.25mm thread size with a 19mm thread length, a 5mm spark position, and a 20.8mm spanner size. The recommended tightening torque for this spark plug is 28 Nm. Its construction ensures efficient combustion and consistent spark delivery, contributing to optimal engine performance. While specific vehicle fitment requires using the 'Select Your Vehicle' tool on the retailer's site, it is listed as compatible with various Audi, BMW, Fiat, and Ford models, among others. As a direct replacement part, installation typically involves removing the old spark plug and installing the new one with the specified torque. No additional post-installation requirements are mentioned for this specific component. The product's suppressed design helps reduce radio frequency interference.