I now understand why VW and other manufacturers use DOT4-LV. This fall I flushed the brakes of my GTI with Valvoline DOT3/4 as PM. Since it's been brutally cold here in WI for the last week or so my clutch action has been unpredictable, like I'm a novice manual driver. After some research I learned about low-viscosity brake fluid and bought some Brembo on Amazon. Since it was time to rotate tires I took the extra time to bleed the brakes and clutch. So much fun in the cold! After the change I notice much improved feel of the clutch, I don't notice much in the brakes but the ABS and stability control should cycle faster with thinner fluid. The different brands of LV say there are no downsides as it still meets DOT4 specs. According to Pentosin: DOT4-LV is <700CsT @-40 dry boiling point 509C, wet 338C DOT4 is <1500cSt @-40 dry boiling point 509C, wet 329C Anyone else in cold regions find a difference?