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A Guide to Air Compressor Oil Capacity

Oil is crucial in maintaining optimal performance and extending the life span of certain types of air compressors. Ensure yours is running efficiently by regularly checking its oil level and knowing how much oil it needs — if any. 

Do Air Compressors Need Oil?

Many air compressors need oil, but not all of them. The main types of air compressors include:

  • Oil-lubricated compressors: These compressors require oil to lubricate moving parts. Regular oil changes are essential to keep units running smoothly.
  • Oil-free compressors: Instead of oil, these compressors use alternative materials or design features for lubrication. This type is ideal for sensitive applications like food processing and painting.

What Kind of Oil Goes in an Air Compressor?

Before adding oil to your air compressor, look at the manual for guidelines. The manual will indicate the type of oil you need and exactly how much oil you should add to the sump for your unit. The most common types of compressor oil include:

  • Mineral oils: Most compressors use mineral oils because they provide adequate lubrication. Mineral oil is a basic lubrication oil and is less expensive than synthetic oils. However, mineral oil can break down at high temperatures, requiring more frequent changes.
  • Synthetic oils: These artificially created oils come from chemical compounds. They provide superior performance, even under extreme pressure and temperature, resulting in longer intervals between changes. 

How to Check a Compressor's Oil Level

Refer to the manual to locate the sight glass on your compressor and check the oil level. Use the sight glass or dipstick for easy monitoring. It's recommended that you examine the level regularly to avoid problems. 

Ideally, the oil level should be in the center of the dot. If it is below the dot, your unit needs more oil. If it is above the dot, you have added too much oil. 

Sigh Glass Too Full

This oil sight glass is showing that the oil level is too high.

How Much Oil Does an Air Compressor Take?

Use the manual as a reference to determine the right oil capacity. Filling your compressor's oil sump to the top can cause significant internal damage to your unit, and underfilling can also cause operational issues. 

Trust the Air Compressor Experts for Preventative Maintenance

Keep your air compressor running as efficiently as possible and ensure it is always operating at the proper oil level. Rely on Chicago Pneumatic for preventive maintenance that greatly reduces the risk of projects being ruined by oil interference in your compressor's airstream. Contact us today for assistance with your oil needs.

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