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How Frequently Should You Change Your Vacuum Pump Oil?

When working with vacuum pumps, the vacuum pump oil you are using and the frequency of changing it is essential. Each pump type has its unique oil requirements. The oil must be tested and changed periodically. These oils are available in hydrocarbon, silicone, and other specific vacuum-formulated forms. It functions as a mechanical lubricant and as a collecting medium for gasmolecules. It has a low vapor pressure and is chemically stable. It is also unreactive to most gases and materials.


In a vacuum pump, oil plays an important role. The vacuum fluid is a vital piece of vacuum creation for oil-sealed vacuum pumps like vane and piston pumps. The vacuum oil, for instance, produces a smooth rotation cycle in oil seal vane pumps, allowing the blades to glide smoothly within the rotor and assisting in the trapping and movement of gas from the intake to the exhaust. Vacuum oil lubricates the gear mechanism even in "dry" pumps like dry screw pumps.

It's critical to choose the right fluid for your specific application since it can work differently for each one of them. Also, vacuum pump oil is not only important for the functioning of a vacuum pump, but it’s also necessary for prolonging its lifespan. A well-maintained vacuum pump can last up to three times longer than a poorly maintained one.

1 Gallon of Vacuum Pump OilFunctions

Lubrication is generally the main use for oil, but it also has other functions like the following.

  • Sealing
  • Cooling
  • Corrosion protection
  • Flushing contaminants
  • Noise reduction

How Often Should you Change Vacuum Pump Oil?

Manufacturers of vacuum pumps will tell you when to change the oil in your pump. However, this is typically only a guideline for pumps that are working on a clean process. This implies that it is up to you to set oil change standards based on your procedure.

Oil changes can be done daily, weekly, or monthly, depending on potential contaminants, application, and oil type. Consider these factors to determine how frequently you should replace your oil:

  • If the vacuum pump level fluctuates, it might indicate oil contamination.
  • If you notice oil discoloration, whether it's darkening for hydrocarbon oils (due to heat or other pollutants) or turning to a creamy hue (brought on by moisture contamination).
  • If the vacuum pump fails to achieve the appropriate amount of vacuum.

When replacing vacuum oil, it's also a good idea to check any filtering that the pump uses, such as screw-on pump filters, exhaust mist filters, and inlet traps. The vacuum pump will work more efficiently if the filters are changed as they approach the end of their useful life.

Buy Quality Vacuum Pump Oil from A-VAC

Not all vacuum pump oils react in the same manner. The negative impacts of using a low-quality lubricant are usually ignored, resulting in poor performance, increased energy consumption, and equipment damage. This is an expensive mistake that frequently exceeds any initial cost savings. When buying from A-VAC, you won't have to worry about any of that. We’ve been in the vacuum pump business since 1969 and can give you peace of mind and a guarantee of quality and ease of operation now and in the future. Contact us today!