A8 Quattro Sedan V8-4.2L (BGK) (2006)
1. Open the coolant expansion tank and insert the first of the four silicate cartridges (Figure 1, 1) into the expansion tank.
2. Press each of the cartridges (Figure 2, 1) carefully past the MIN mark (Figure 2, 2) in the tank without damaging the silicate cartridge.