Genuine VW Audi High Performance Oil for Haldex Coupling G 060 175 A2 This OE High Performance Oil for Haldex Coupling for most 4Motion / Quattro Models A lot of people don't bother to change the Haldex Oil as they think the fluid is lifetime fill like the rear differential. This is not the case. VW / Audi recommend changing the oil very 36 months regardless of miles/km We would advise to change this at least every 40k miles in some cases a low as every 20k miles.