Volkswagen/Audi can't use locking diffs in their Haldex/Torsen setups. They use EDL, which might be even better for on-road snow driving. It applies brakes to spinning wheels and allows power delivery to wheels with traction. Thats why when your wheels start spinning in the snow or ice, you keep ON the throttle so that the ECU can properly make adjustments to all of the electronic subsystems and haldex that will help you get out of your situation. Every time you let off of the throttle you're resetting those systems and making them start their adjustments from scratch.Here in Denver we've received some much needed snow during the past week. I know the "snowflake" mode receives a fair amount of flak for lower power as it is short-shifting to keep the torque low to reduce wheel-spin, but it works quite well for me. Curious if anyone knows if it also locks the rear diff or it's only locking on-demand when wheelspin is detected.