Can Hydraulic Oil and Engine Oil Be Mixed?

1 Answers
OwenRose
07/25/25 12:37pm
Hydraulic oil and engine oil absolutely cannot be mixed. Mixing them will alter the viscosity, reduce foam resistance and air release properties, increase oxidation resistance and anti-wear performance, and decrease demulsibility. Overall, the oil quality will change. Introduction to Engine Oil: Internal combustion engine oil is specifically designed for gasoline and diesel engines based on engine operating requirements. It demands high detergency and dispersancy among other performance characteristics, containing several functional additives such as detergents and dispersants. Introduction to Hydraulic Oil: Hydraulic oil is primarily used in various hydraulic systems. Its viscosity grade is determined by the operating conditions of the hydraulic system. The additives include anti-oxidation, anti-rust, and anti-wear agents, which are entirely different from those in internal combustion engine oils.
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