SSBC & DOT 5 fluid

As far as I remember, castrol gt lma is what I used in my british cars that had british rubber. If you used standard DOT it will rot the rubbers in quick time..just around 1 year ot two. For my american metal..I use what ever is the highest DOT at the time...I would be curious where the rubber was manufactured.

BTW, what was recommended ?

Grassy