Upgrade your Audi or Porsche with these high-quality Bosch WR5DP spark plugs. Made with platinum material, these vintage spark plugs have a thread diameter of 14mm and a hex size of 21mm. They replace the OE/OEM part number 0242245519 and have a voltage of 12V. With a standard configuration and installation depth of 19mm, these spark plugs are perfect for any gasoline fuel type. Manufactured in Germany, they come with the interchange part number 4238 and are a great addition to any car or truck. Don't miss out on this performance part that ensures your ignition system's optimal functioning.