Previously I was able to source the factory speced Castrol Response DOT 4+ brake fluid and a Jag/British car specialist. They no longer stock it. Does any one have a US source? The closest alternative looking at the wet and Dry boiling point and viscosity is ATE SL6 and MOTU. Since I have not tracked my Vantage to date, it would seem that having the less viscous fluid (for the ABS) as speced would be the most important but assume either fluid would be more than sufficient.

 

Motul RB600 and ATE blue here. Both are great.

 

The name has changed to Castrol React Performance DOT4, this is why you can't source Castrol Response Super DOT4 anymore..