Similar to W12, W18 is made by mating two VR8s together, although at the moment Volkswagen group has not shown any VR8. The VR8 consists of 2 banks of 4-cylinder, mated at 15° just like VR6. The two VR8s then join together at 72°. In other words, W16 is just a W12 with one more cylinder added to each bank.