Oil change in a screw compressor – which oil to choose?

Compressor oil is one of the key components that ensures long and trouble-free operation of the screw compressor. The proper selection of lubricant and regular technical inspections directly affect the device's lifespan and the efficiency of the entire compressed air system.

In this article, you will learn:

• Why is oil replacement in a screw compressor so important?
• What oil is suitable for a screw compressor?
  • How is screw compressor oil different from other industrial oils?
  • Oil replacement frequency – what does it depend on?
• Role of the oil separator in screw compressors
• Summary and Cormak’s offer

Why is oil replacement in a screw compressor so important?

Screw compressor oil serves several important functions – it lubricates moving parts, cools friction-exposed elements, seals the space between rotating screws, and removes contaminants. Over time, its physicochemical properties degrade – it loses viscosity, oxidizes, and accumulates deposits. Delayed replacement can lead to excessive wear or serious breakdowns.

What oil is suitable for a screw compressor?

The choice should follow the machine manufacturer’s guidelines. What oil to choose for a screw compressor to ensure top performance? Types include:

• Mineral oils – used in older models or less demanding applications.
• Synthetic oils – offer better performance at high temperatures and longer service intervals.
• Semi-synthetic oils – a compromise between price and quality.

A properly selected screw compressor oil should resist oxidation, have high thermal stability, and good lubrication properties. The industrial machinery manufacturer offers machines adapted to work with various oil types.

How is screw compressor oil different from other industrial oils?

Compressor oil differs from standard oils by:

• low foaming tendency,
• oxidation resistance,
• compatibility with oil and condensate separation systems,
• ability to operate at high temperatures.

High-quality compressor oil improves cooling efficiency, reduces energy consumption, and keeps the compressor system clean.

Oil replacement frequency – what does it depend on?

Typical oil replacement is done every 2,000 to 4,000 hours, though synthetic oils may last twice as long. Factors affecting replacement intervals:

• type of oil used,
• machine usage intensity,
• working conditions (ambient temperature, humidity, dust),
• compressor type – screw compressors and high-pressure compressors may have different requirements.

Maintain a service schedule and monitor oil condition to avoid unexpected downtime.

Role of the oil separator in screw compressors

The oil separator is essential in screw compressor systems. Its task is to separate oil from compressed air before it reaches the installation. A good separator reduces oil loss, improves air quality, and lowers energy use.

It should be replaced as per the maintenance schedule, and matched to the oil type and compressor workload.

Summary and Cormak’s offer

Regular oil changes and the right lubricant are crucial to efficient operation. No matter which oil you choose for your screw compressor – always consider not just price, but also the manufacturer’s recommendation and operating conditions.

In the Cormak online store, you'll find a wide range of screw compressors as well as expert support. The offer also includes industrial machinery for various sectors – from metalworking and woodworking to compressed air systems.

Take care of your compressor – invest in high-quality screw compressor oil and avoid costly failures.