Is There a Problem with Adding Engine Oil to Hydraulic Oil?

1 Answers
Lindsey
07/29/25 4:48am
Adding engine oil to hydraulic oil is problematic and will render the hydraulic oil unusable. Consequences of adding engine oil to hydraulic oil: Mixing a small amount of engine oil into hydraulic oil will alter the viscosity and viscosity-temperature properties of the hydraulic oil, affecting its performance. Quality requirements for hydraulic oil: Suitable viscosity and good viscosity-temperature properties to ensure accurate and responsive power transmission under varying working temperatures, while also ensuring proper lubrication of hydraulic components; excellent rust prevention and oxidation stability to resist degradation under high temperature and pressure conditions, ensuring a long service life; good anti-foaming properties to allow foam generated under continuous mechanical agitation to dissipate quickly, ensuring stable power transmission and preventing accelerated oxidation of the hydraulic oil.
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