I use Amsoil in my B2400. All other brands of hydraulic fluid I used caused me to lose power steering after an hour of hard mowing. That's over a period of 10 plus years. Since I've been using Amsoil for the last year and half I've had NO problems with my power steering. Is it a coincidence?
I have every Amsoil diesel oil and they worked great; from my old bx22 to my newer 24. Now using There 5w-40 and Lc20...best combo out there for great UOA for me.