Introduction to the Uses of Used Engine Oil from Cars and Bikes

Used engine oil from cars and bikes is a common byproduct of vehicle maintenance and can be both a challenge and an opportunity for resource management. In my over 30 years in the waste petroleum and lube oil industry, I have seen various ways this valuable resource can be repurposed. This article will explore different uses for used engine oil, emphasizing its recycling and usage in various applications.

Understanding Used Engine Oil

Before diving into the uses of used engine oil, it's important to know what we're dealing with. Used engine oil is the collected, partially worn-out lubricant from the crankcase of a gasoline or diesel engine after it has been in service. This oil usually contains various contaminants including water, sediment, and trace amounts of impurities due to the engine's operation.

What is the Waste Stream?

In the waste oil/fuel oil industry, BSW (Blind Spot Water) is a term used to describe water present in the waste oil. This water can be present due to condensation, spillage, or the oil's use in damp conditions. Proper processes must be in place to remove the BSW to prevent damage to further processing units or final products.

Removing Water and Sediment

One common method to remove water and sediment from used engine oil is through a settling process or using centrifuges. Understanding and implementing these methods can significantly enhance the quality of the oil for reutilization purposes.

Repurposing Used Engine Oil

Used engine oil isn't just waste; it can be a valuable resource with a variety of applications. Let's explore some of the uses:

1. Lubrication

In some unconventional settings, such as a truck's conveyor belt, used engine oil can serve as a lubricant. A combination of diesel and used engine oil (20 diesel and 80 used oil) can be effective in cold weather due to its viscosity and lubricating properties.

2. Preservative

Another unique use of used engine oil is as a preservative. Diluted with a small amount of diesel, it can be used to protect flatbed trailer flooring, offering ease of application and maintenance.

3. Fuel Alternative

Filtered used engine oil can be used as a fuel oil for oil-burning heaters or older diesel engines. While efficiency can be lower compared to virgin fuel, it can still be a viable alternative, especially for small-scale operations or emergency situations.

4. Agricultural and Environmental Applications

Historically, used engine oil was used for weed control and mosquito larvae eradication. However, modern new engine oil is less toxic, making traditional uses less advisable. Used engine oil from older engines, however, can contain toxic metals and hydrocarbons, which can have adverse environmental effects if not properly managed.

Recycling and Reuse

Most used motor oil is collected at local garages and sent to refineries for re-refining. This process involves a series of steps to remove contaminants and reclaim the base oil. There are plans and equipment available to build waste oil heaters for garages and workshops, enabling local treatment and reuse.

Proper Handling and Processing

Proper handling and processing of used engine oil are crucial to ensure safety and environmental compliance. Steps include removing BSW, filtering out contaminants, and ensuring that the oil meets ASTM specifications. Blotter tests can be a simple way to determine when an oil change is needed, providing a ballpark gauge of oil quality.

Common Myths and Misconceptions

There are misconceptions around the use of used engine oil. For example, the idea of using used engine oil as new oil (bilge skimmings) can be risky if not properly tested and reconditioned. In the U.S., strict NHTSA and EPA regulations have made it more challenging to use used oil as a direct substitute for new oil, emphasizing the importance of re-purification and adherence to safety standards.

Conclusion

Used engine oil from cars and bikes holds significant potential for reuse and recycling. Through proper handling, processing, and application, this valuable resource can contribute to environmental sustainability and operational efficiency. Understanding the different uses and methods ensures that waste is minimized, and resources are maximized.