ISO 46 vs. ISO 68: Choosing the Right Oil for Your Rotary Screw Air Compressor

Rotary Screw Air Compressor Oil

Rotary screw air compressors rely on high-quality oil to stay cool, lubricated, and protected. But with multiple viscosity grades available, many users wonder whether ISO 46 or ISO 68 is the better choice. The truth is that both oils perform well—but only when matched with the right operating conditions.

This guide simplifies the differences and helps you decide which oil grade is ideal for your compressor and environment.

Understanding Viscosity in Compressor Oil

Viscosity is the oil’s thickness.

  • ISO 46 = thinner

  • ISO 68 = thicker

Choosing the wrong viscosity can lead to overheating, increased wear, or reduced efficiency. The correct grade ensures proper lubrication, smooth cooling, and dependable performance.

When ISO 46 Compressor Oil Is the Better Fit

ISO 46 is designed for easier flow, especially when temperatures are moderate or low.

Ideal for:

  • Indoor or climate-controlled environments

  • Light to medium workloads

  • Facilities where compressors run at stable, cooler temperatures

  • Newer compressors optimized for energy efficiency

Advantages:

  • Quicker oil circulation during startup

  • Lower friction and slightly reduced power consumption

  • Stable cooling performance for everyday use

If your compressor operates indoors or doesn’t face high heat or heavy stress, ISO 46 is usually the most efficient choice.

When ISO 68 Compressor Oil Is the Right Option

ISO 68 is thicker and built for harsher, hotter, or more demanding working conditions.

Ideal for:

  • Hot weather locations

  • Heavy-duty industrial applications

  • Older compressors with worn components

  • Continuous 24/7 operation at high loads

Advantages:

  • Stronger oil film to handle heat and pressure

  • Reduced thinning at elevated temperatures

  • Extra protection for heavily loaded systems

For compressors installed in factories, workshops, or outdoor areas exposed to heat, ISO 68 offers more durability and better thermal control.

How to Decide Between ISO 46 and ISO 68

To pick the right oil grade, consider:

1. Your climate

  • Cool or controlled environments → ISO 46

  • Hot environments → ISO 68

2. Your workload

  • Light or moderate use → ISO 46

  • Heavy or continuous use → ISO 68

3. Manufacturer recommendations

Always follow the compressor model’s oil guidelines when available.

4. Operating issues

If your compressor runs too hot, stepping up to ISO 68 can help.

5. Equipment age

Older compressors often benefit from the thicker protection of ISO 68.

Final Thoughts

Both ISO 46 and ISO 68 oils play important roles in rotary screw compressor performance. The key is matching the oil to your working conditions:

  • ISO 46: Best for cooler environments and standard workloads

  • ISO 68: Best for high temperatures, heavy duty cycles, or aging equipment

Using the correct oil not only boosts efficiency but also extends the lifespan of your compressor—saving you money and downtime in the long run.

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