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Circulating Oils

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Segments
Oil Type
Viscosity

Aminol™ CircoSynth 68 LX

AL/CO-0015

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Aminol™ CircoSynth 100 LX

AL/CO-0016

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Aminol™ CircoSynth 150 LX

AL/CO-0017

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Aminol™ CircoSynth 220 LX

AL/CO-0018

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Aminol™ Circulating Oil 32 AW

AL/CO-0001

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Aminol™ Circulating Oil 46 AW

AL/CO-0002

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Aminol™ Circulating Oil 68 AW

AL/CO-0003

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Aminol™ Circulating Oil 100 AW

AL/CO-0004

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Aminol™ Circulating Oil 150 AW

AL/CO-0005

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Aminol™ Circulating Oil 220 AW

AL/CO-0006

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Aminol™ Circulating Oil 320 AW

AL/CO-0007

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Aminol™ Circulating Oil 460 AW

AL/CO-0008

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Filtering

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What Are Circulating Oils? Uses, Types & Benefits

One of the most crucial factors in extending the life of industrial equipment is a proper lubrication system. Among its key components are circulating oils, which ensure smooth operation, protect components, and enhance system reliability.

Circulating oils are widely used in turbines, gearboxes, compressors, and bearing systems — they reduce friction, transfer heat, prevent corrosion, and clean internal parts by carrying contaminants to filters.

In this guide, you’ll learn what circulating oils are, how they work, the difference between C1, C2, C3, and C4 oils, and how to select the right one for your machinery.

H2: What Are Circulating Oils Used For?

As the name suggests, circulating oils continuously circulate within a closed-loop system, performing several essential functions:

Because of these functions, circulating oils are considered one of the most reliable lubrication solutions, alongside hydraulic oils, gear oils, and turbine oils.

H2: How Does a Circulating System Work?

A circulating lubrication system works by using a pump to move the oil throughout the machinery. The oil travels through filters, lubricates moving components such as bearings and gears, and then returns to the reservoir to be cooled, filtered, and reused.

Here’s a simplified cycle:

  1. The pump draws oil from the main tank.
  2. The filter removes dirt and contaminants.
  3. The oil flows through distribution lines to lubrication points.
  4. Heat is transferred away, and the oil returns to the tank.

This closed-loop process ensures consistent lubrication, efficient cooling, and extended oil life — resulting in less downtime and lower maintenance costs.

What Are C1, C2, C3, and C4 Oils?

When choosing circulating oils, you’ll often encounter the terms C1, C2, C3, and C4. These categories indicate different performance levels, viscosity grades, and application suitability.

Among them, C3 and C4 oils are preferred for diesel engines and high-pressure industrial applications that demand durability and stability.

 Bearing Oil vs. Circulating Oil — What’s the Difference?

Although both serve lubrication and cooling purposes, their applications differ:

In many cases, the same oil can perform both roles — hence the combined term “bearing and circulating oils.”

 How to Choose the Right Circulating Oil

Selecting the correct oil is essential for performance, longevity, and cost efficiency. Consider these key factors:

  1. Operating temperature and pressure range
  2. Viscosity grade (ISO VG 32, 46, 68, etc.)
  3. Anti-oxidation and anti-rust additives
  4. Filterability and stability
  5. Manufacturer’s technical recommendations

 Tip: Explore Aminol Circulating Oils — engineered for industrial reliability and superior lubrication performance.

Frequently Asked Questions (FAQ)

1. Is circulating oil the same as hydraulic oil?

No. Hydraulic oil mainly transmits pressure, while circulating oil provides lubrication and cooling.

2. How often should circulating oil be changed?

It depends on system load and operating conditions. Typically, replacement is recommended every 6–12 months.

3. What happens if circulating oil overheats?

Excessive heat leads to oxidation, which reduces the oil’s protective and lubricating properties — that’s why cooling systems are essential.

4. Can turbine oil be used as circulating oil?

Yes, many turbine oils are also suitable for circulating systems, depending on the manufacturer’s specifications.

5. Can C3 and C4 oils be mixed?

Mixing is not recommended unless specified by the manufacturer — different formulas may cause performance instability

 Benefits of Using Circulating Oils

 Reduce mechanical wear and friction
 Maintain thermal balance and system temperature
 Extend equipment life
 Lower maintenance frequency
 Improve energy efficiency

Circulating oils are the backbone of smooth, reliable, and long-lasting industrial performance. By maintaining lubrication, cooling, and cleanliness, they protect vital components and ensure consistent operation even under demanding conditions.

If you’re looking for a high-quality, long-life circulating oil for your system,
👉 Explore Aminol Circulating Oils here.

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