Originally Posted by T_Terror
DOT5 or 5.1 us supposed to be the best at street level cars. Dont quote me, i just got i out of Street Machine
Unfortunatly the new DOT5.1 and higher like the race stuff Castrol SRF ($130 a litre
) is a different compound (silicone based I think) to the DOT3 , DOT4 and DOT5 (mineral based I think or visa vera) and the 2 are not compatable at all and you will need to replace all the rubbers and give the system a thorough flush out or you will still get cross contamination
Unless you have mega dollar brakes and hit mach1 and want pull up in the space of 10 inches all the time the DOT4 will be suffice.