BC Racing BR RS Coilovers for Audi A6 C8 Avant 2018+ FWD 48.5mm StrutSupplied in default spring rates, at the time of writing are: 10 10KG Please note that these may be adjusted by BC based on customer feedback, if you require a specific spring rate, please contact us. The BR series coilovers use a large 46mm diameter piston in a 53mm diameter damper body to maximise oil capacity. As the damper unit operates the oil contained within heats up. The viscosity of oil changes as its temperature varies which can lead to