Varnish formation and acid are common problem in the lube and hydraulic systems of today’s  Electro-Hydro Control machineries. The severity of the varnish formation can be aggravated by the specific oil chemistry, hot spots in the lube oil system, and static discharge. Hilco’s ionic exchange technology has proven to be an effective method in reducing varnish potential in a wide variety of applications in both mineral and synthetic fluids.