[Eugene at Pelican Parts]

All brake fluids absorb moisture from the air, therefore need to be bled out at suggested intervals. However, the higher the boiling point of the fluid (i.e. ATE Super Blue), the more moisture it absorbs. If you wish to not bleed your Porsche so frequently and it is a street-only car, DOT3 will suffice. Although ideally, hydraulic brakes are closed systems, the fluid will eventually take in some moisture over time, causing boilovers at excessive temperatures.