This year, I used 5.1 in both the car & the bikes. The car spec is dot 3 but 4 was used in the past. I went to toyota for the last change and they use toyota 5.1. I went with the flow & glad I did so! The pedal was not only much firmer after the change, but still so 8 months later (dot 3-4 loose their bite over this period). I also used liquimoly 5.1 (£6) on my bikes and what a difference.The brak lever is so much firmer & more direct, I have had to mentally readjust how much I squeeze it. Far better performance over motul RBF600 (£12)
The rbf660 will have a higher boiling point still to the normal 5.1, so won’t fade as it’s a racing fluid
