... test. Anti-friction Hydraulic Oil Additive1. DescriptionKT220 is an additive of good quality, which has passed the bench test. ... from the mixture of high-quality antioxidant, anti-corrosion, anti-wear additive, corrosion inhibitor, anti-hydrolytic additive and so on. ... , and application are the same as those of common petroleum products, having no need of special protection. hydraulic oil additive