Hydraulic Oils

Match the oil to the equipment manufacturer’s specification (viscosity grade, ISO/VG rating, and any performance standards), consider operating temperature and load conditions, and choose mineral or synthetic base fluids based on desired life and temperature stability

Select the viscosity/ISO grade recommended in the equipment manual; lower ISO numbers (e.g., ISO 22–32) suit lighter, low-temperature systems while higher numbers (e.g., ISO 46–68+) are for heavier loads and higher operating temperatures

Mixing is possible only when fluids share compatible base stocks and additive chemistry and meet the same specifications; check manufacturer guidance and, if uncertain, drain and flush the system before switching to avoid additive incompatibility or seal issues

Synthetic oils generally provide better oxidative stability, wider temperature-range performance, longer drain intervals, and improved wear protection, while mineral oils are typically less expensive and may be adequate for less demanding applications

Change intervals depend on operating conditions and oil type but follow equipment manufacturer recommendations or condition-monitoring results; store sealed containers in a clean, dry, temperature-controlled area away from direct sunlight and contamination

Water, particulate dirt, and degraded oil are common contaminants; use proper filtration, breathers, clean-fill procedures, and routine fluid analysis to monitor contamination levels and prevent component wear or failure

Compare oils by required performance specs, viscosity, base type (mineral vs synthetic), and recommended drain intervals; budget options are commonly available under $50 while higher-performance/synthetic fluids typically cost more but can reduce maintenance frequency