How to Find a Hydraulic Oil Equivalent (Complete Guide)

Searching for a hydraulic oil equivalent can be confusing. Not all ISO 46 or ISO 68 oils perform the same — even if they share the same viscosity grade.

Here's how proper oil equivalency matching works.

Step 1: Match the Viscosity Grade

Hydraulic oils are commonly categorized by ISO VG numbers such as:

• ISO VG 32
• ISO VG 46
• ISO VG 68

However, viscosity alone is not enough for accurate cross referencing.

Step 2: Check Performance Standards

Different hydraulic oils may include:

• Anti-wear (AW) additives
• Zinc-based or zinc-free formulations
• High-pressure protection
• Oxidation resistance

An oil cross reference tool compares these technical characteristics to ensure compatibility.

Step 3: Verify OEM Approvals

Many equipment manufacturers require specific approvals. Always confirm that the alternative oil meets required specifications.

Common Mistake: Matching by Name Only

Two oils may sound similar but differ significantly in additive chemistry and performance level.

A proper lubricant cross reference database eliminates guesswork and reduces risk.