HR hydraulic oil is a kind of hydraulic oil used in low and medium pressure hydraulic system with great variation of environment temperature. The oil has good anti-rust and anti-oxygen properties, and on this basis, added viscosity index improver, so that the oil has good viscosity-temperature characteristics. This kind of oil has not been developed vigorously because of its small consumption, so it is not introduced in detail here. Hg hydraulic oil, formerly 32G and 68G of common hydraulic oil, used to be called hydraulic guide oil. This product is composed of HM hydraulic oil based on the addition of oiliness agent or antiwear agent, a class of hydraulic oil. The oil not only has excellent rust-proof, anti-oxidation and anti-wear properties, but also has excellent anti-stick-slip property. This product is mainly suitable for various machine tool hydraulic and guide rail lubrication system or machine tool guide rail lubrication system and machine tool hydraulic system. The anti-creepage effect is good under low speed idling condition. Hydraulic one guide rail oil belongs to this kind of product.