Rotary Screw Air Compressor Oil: A Comprehensive Guide

Keeping your rotary screw air compressor in top condition is crucial for ensuring its performance and longevity. One of the most important aspects of maintaining your air compressor is understanding the role and requirements of the oil used within the system. If you're uncertain about which oil to use or when to change it, you're not alone. These are common questions, and the answers can greatly impact the efficiency and lifespan of your equipment. Let's dive into the top eight frequently asked questions about rotary screw air compressor oil to help you keep your compressor running smoothly.

What is Air Compressor Oil?

Air compressor oil is a specially formulated lubricant designed for air compressors. Unlike motor oil, air compressor oil doesn’t contain detergents and has lower levels of contaminants such as carbon and sulphur, which can cause build-up and damage. Most rotary screw air compressors use synthetic oil, designed to handle high temperatures and provide consistent lubrication over time. This oil typically starts as yellow or light brown and darkens as it becomes contaminated. Knowing the differences in oil types helps you choose the best one for your compressor and maintain its efficiency.

Why Do Rotary Screw Air Compressors Need Oil?

Oil in a rotary screw air compressor serves multiple purposes beyond just lubrication. It helps to lubricate moving parts, prevents wear, and cools the air during compression. Additionally, it creates a seal between the rotors, trapping air and ensuring efficient compression. Many rotary screw compressors are “oil-flooded” or “oil-injected,” meaning oil is injected into the rotor housing to mix with the air during compression. The oil is then separated from the compressed air before it exits the system. While oil-free compressors exist, they tend to be louder, more expensive, and are typically used in industries where oil contamination must be avoided, such as food processing or medical applications.

What Kind of Oil Does a Rotary Screw Air Compressor Take?

Choosing the correct oil for your rotary screw air compressor is essential for its longevity and performance. Some compressors require a specific type of oil, and using the wrong one can void warranties or cause mechanical issues. Always refer to your compressor’s manual to determine the recommended oil type. In general, if a specific brand isn’t required, a non-detergent oil of either 20-weight or 30-weight may be suitable. For colder environments, a 20-weight oil is often preferred, while a 30-weight oil is better for warmer climates. Some operators switch between these oils depending on the season to optimise performance.

When Should I Change Air Compressor Oil?

Changing your air compressor oil regularly is vital for maintaining its efficiency and extending its life. The frequency of oil changes depends on the compressor type and how often it’s used. For example, some compressors may require an oil change every 200 hours of operation or every six months, while others might have different intervals, like 500 hours or annually. Always consult your compressor’s manual for the manufacturer’s recommended maintenance schedule. Keeping up with oil changes helps prevent wear and tear and ensures your compressor continues to operate smoothly.

How Do You Check the Air Compressor Oil Level?

Checking the oil level in your air compressor is a simple but important maintenance task. Before starting the compressor, ensure it is cool and depressurized. If your compressor has a sight glass, check that the oil level is between the “MAX” and “MIN” markers. If the oil level is low, carefully remove the fill cap, add the appropriate oil, and avoid overfilling. If there’s no sight glass, use a dipstick to check the oil level, looking for the “min” and “max” indicators. Regular checks help you maintain the correct oil level and avoid potential damage from running the compressor with insufficient oil.

How to Change Air Compressor Oil?

Changing the oil in your rotary screw air compressor involves several steps, and following your manual is crucial for doing it correctly. Generally, the process starts with draining the old oil into a suitable container, replacing the oil filter, and filling the compressor with new oil. Be sure to clean around the fill cap and oil filter to prevent contamination. After adding new oil, check for any leaks and ensure the oil level is correct before restarting the compressor. Regular oil changes are key to maintaining optimal compressor performance and preventing costly breakdowns.

How Much Air Compressor Oil Do You Need?

The amount of oil your rotary screw air compressor requires can vary widely depending on the model and manufacturer. Many compressors hold between 1 to 2 gallons (4 to 9 litres) of oil, but this can differ. Always check your air compressor’s manual to find out the specific oil capacity for your machine. Using the correct amount of oil is important to maintain proper lubrication and cooling within the system, ensuring your compressor runs efficiently.

Where Can You Buy Air Compressor Oil?

Finding the right oil for your air compressor is easy, as it’s widely available at air compressor dealers, hardware stores, and some automotive shops. For a convenient option, you can also purchase high-quality air compressor oil directly from our website. We offer a range of oils tailored to meet the needs of different compressors, ensuring you get the best product for your equipment.

Conclusion

Proper maintenance of your rotary screw air compressor, including using the right oil and following regular service schedules, is key to ensuring its long-term performance. By understanding the importance of air compressor oil and how to maintain it, you can avoid unnecessary repairs and extend the life of your equipment. For more information or to purchase the right oil for your compressor, visit our website. Taking these steps will help you keep your compressor running smoothly and efficiently, minimising downtime and maximising productivity.