Choosing between AW32, AW46, and AW68 hydraulic oil can be confusing, especially when several grades seem suitable for the same machinery.

The right hydraulic oil viscosity can affect equipment performance, wear, and operating efficiency.

So, what is the difference between these hydraulic oil grades, and which one should you use?

What Do AW32, AW46 and AW68 Mean?

The numbers refer to the oil’s ISO VG viscosity grade. In simple terms, the higher the number, the thicker the oil is at operating temperature.

  • AW32: Lower viscosity and flows more easily
  • AW46: Medium viscosity for general applications
  • AW68: Higher viscosity for heavier-duty applications

The “AW” stands for anti-wear. AW hydraulic oils contain additives designed to help protect hydraulic components from wear.

However, a higher number does not automatically mean better protection. The correct grade depends on your equipment and operating conditions.

AW32 Hydraulic Oil: When Is It Suitable?

AW32 hydraulic oil is a lower-viscosity option. It can be suitable for systems that require easier oil flow and operation at lower temperatures.

Common applications may include:

  • Hydraulic equipment requiring ISO VG 32
  • Certain industrial machinery
  • Mobile equipment operating in suitable temperature conditions
  • Systems where the manufacturer specifies AW32

Using a viscosity that is too high can make oil flow more difficult during startup. Always check the equipment manufacturer’s recommendation before switching grades.

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AW46 Hydraulic Oil: A Common Choice for General Applications

AW46 hydraulic oil is widely used across industrial and mobile hydraulic systems. Its viscosity sits between AW32 and AW68.

It may be suitable for:

  • Industrial hydraulic systems
  • Construction equipment
  • Hydraulic presses
  • Machine tools
  • Mobile hydraulic equipment

If your machinery operates under normal Malaysian conditions, AW46 may be specified for certain applications.

However, the correct choice still depends on the equipment manufacturer’s requirements.

AW68 Hydraulic Oil: For Higher Viscosity Requirements

AW68 hydraulic oil is thicker than AW32 and AW46. It may be suitable for equipment requiring higher viscosity hydraulic oil, particularly under certain heavier-duty operating conditions.

Applications can include:

  • Industrial hydraulic systems
  • Heavy machinery
  • Hydraulic presses
  • Equipment operating at higher temperatures
  • Systems specified for ISO VG 68

Using AW68 when your equipment requires a lower viscosity grade can affect flow and system efficiency. Always follow the recommended viscosity range.

AW32 vs AW46 vs AW68: Which Should You Choose?

There is no single best hydraulic oil grade for every machine.

Before choosing, consider:

  • Equipment specifications: Check the owner’s manual or OEM recommendation.
  • Operating temperature: Temperature affects hydraulic oil viscosity and flow.
  • Operating pressure: High-pressure systems need suitable anti-wear protection.
  • Machine workload: Heavy-duty applications may have different viscosity requirements.
  • System components: Pumps, valves, and other components may require specific oil grades.

The goal is not to choose the thickest or most expensive oil. It is to choose the right hydraulic oil for your hydraulic system.

Can You Switch Between AW32, AW46 and AW68?

Do not switch hydraulic oil grades simply because another grade is available.

Changing viscosity can affect system performance. Mixing different hydraulic oils can also create compatibility concerns.

If you need to change grades, check the manufacturer’s recommendations first.

A hydraulic oil supplier can also help you determine whether the proposed oil is suitable.

Get the Right Hydraulic Oil from Enerplus

Still unsure whether you need AW32, AW46, or AW68 hydraulic oil?

Enerplus supplies a range of hydraulic oils from established lubricant brands for industrial and heavy-duty applications.

Our team can help you identify the right product based on your equipment requirements and operating conditions.

Looking for a reliable hydraulic oil supplier in Malaysia? Contact Enerplus for hydraulic oil supply and product recommendations tailored to your machinery.

The right viscosity can make a difference. Start with the right oil.

    Next Read: How to Choose the Right Industrial Lubricant for Heavy Machinery