Millers Oils Universal Brake Fluid Clutch DOT 4 DOT4 High Boiling Point 1 Litre

While topping up the oil at that frequency may be annoying and possibly expensive, there is generally nothing to worry about. Wet Boiling Point: 165°C. Dry Boiling Point: 260°C. Suitable for all braking systems where a non-mineral fluid is required.

eBay