Is the Consequences of Mixing Engine Oil and Hydraulic Oil Serious?

1 Answers
OAdrian
07/30/25 8:02am
Engine oil and hydraulic oil cannot be mixed because their viscosities are different, and mixing them can have serious consequences. Mixing engine oil and hydraulic oil will alter the viscosity and viscosity-temperature properties of the hydraulic oil, thereby affecting its performance. It can clog filters, prevent oil pressure from rising, and accelerate the aging of oil seals and rubber sealing rings in the hydraulic system. Engine oil is specifically designed for gasoline and diesel engines based on engine requirements, demanding high detergency and dispersancy among other performance characteristics. It contains several functional additives, including detergents and dispersants. Hydraulic oil is primarily used in various hydraulic systems. Its viscosity grade is determined by the operating conditions of the hydraulic system, and it contains additives such as anti-oxidants, rust inhibitors, and anti-wear agents, which are entirely different from those in engine oils. Typically, hydraulic oil lacks detergency and dispersancy, making it unsuitable for use as engine oil. However, to simplify the variety of oils used on-site, there are rare cases where engine oil (with suitable viscosity) is used as hydraulic oil. Yet, its performance indicators, such as emulsification and hydrolytic stability, do not meet the specifications required for hydraulic oil. Therefore, in underground, aquatic, or humid environments, engine oil must never be used as a substitute for hydraulic oil.
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