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Basic Hydraulic Fluids

Choosing the correct hydraulic fluid for the correct application can be confusing. There are a lot of different specs offered by various OEM’s across numerous markets. But with a few simple tips, anyone can narrow down the correct fluid. Below is a simple explanation and overview of the best-selling environmentally friendly hydraulic fluids offered by Renewable Lubricants. We have included a link to the datasheet of these products and also a link to where they can be bought. The datasheet will have further listed OEM specs and certifications. Please contact us directly if you have further questions.

Traditional Hydraulic Fluid Replacements


  • Readily Biodegradable/VGP approved
  • Our most popular hydraulic fluid sold, also the most affordable.
  • Bio-Fleet does not sacrifice performance for cost.
  • Designed to replace any zinc or zinc-free petroleum hydraulic fluids on the market.
  • Perfect for leaky hydraulic systems.
  • ISO Grade Available: 22, 32, 46, 68, 100
  • Perfect for use in: Waste Disposal, Construction, Forestry, Municipalities, Boat Lifts, Mowers, Mining

Bio-Ultimax 1000:

  • Readily Biodegradable/VGP approved
  • Improved oxidation stability and cold temperature performance over Bio-Fleet Hydraulic Fluid
  • Oxidation performance comparable to full synthetics on the market.
  • Direct replacement for premium petroleum hydraulic fluids.
  • Can be used in conjunction with oil analysis to save the customer time and money.
  • ISO Grade Available: 32, 46, 68, 100
  • Perfect for use in: Construction, Forestry, Marine, Hydro Electric, Government, Mining

Bio-Ultimax 1200 LT:

  • Readily Biodegradable/VGP approved
  • Full Synthetic
  • Designed for extreme cold temperature performance.
  • Direct replacement for Top Tier Hydraulic fluids
  • ISO Grade Available: 5, 10, 15, 22, 32, 46, 68
  • Perfect for use in: Cold Temperatures Applications, Hydro Electric, Marine, Forestry, Construction

This is not our full line of hydraulic fluids but our best-selling traditional hydraulic fluids. RLI also offers more specialized fluids such as: Dielectric, Food Grade, HEES, Fire Resistant, Tractor/Trans (UTF) and HEPR hydraulic fluids. To learn more about our specialized hydraulic fluids check out our blog post.

When buying hydraulic fluids, RLI recommends looking at the OEM spec. Call or email us directly and we can help.