I've had stainless steel sleeves in my '69 Corvette Calipers AND Dot 5 (silicone fluid) for 30 yrs). I know Billy told me he didn't recommend silicone fluid when he did my '69 Camaro MC *but that's what I put in it*, since he couldn't tell me WHY NOT and I've had great luck with silicone DOT 5 in *reducing maintenance* on my brake systems. He installed brass sleeves in my '60 Corvette MC (it also has silicone fluid) and in my '69 Camaro MC also brass sleeved with silicone fluid.
PS. I'd rather have the zero maintenance of silicone fluid use, than the whitepost lifetime warranty...
.. although I believe Lonestar also gives a lifetime warranty on their stainless caliper rebuilds.