I use dot 5 hydraulic fluid in all my systems. This includes my motorcycles, cars and floor jack. 40 years with no failure. including ABS. I got mine free from the lab testing it. The US military uses it exclusively. I do remove all dot3/4 fluids before conversion. no glycol allowed. Residual oil not a factor.Dot 5 is inert. If system fouled...flush it or strip it.