DeWalt Pressure Washer Oil Capacity and Recommendations


Maintaining proper oil levels in your DeWalt pressure washer is crucial for its performance and longevity. Proper lubrication ensures that the machine operates smoothly, reduces wear and tear, and prevents costly repairs. Most DeWalt pressure washers feature two distinct oil systems: the engine oil and the pump oil. Understanding the oil requirements for both these systems is essential for the optimal functioning of your pressure washer.

Engine Oil

Capacity and Recommendations

The typical capacity for engine oil in DeWalt pressure washers is around 1.2 quarts. It’s important to check the specific requirements for your model, but 1.2 quarts is a common figure. For optimal performance across various temperatures, it is recommended to use SAE 10W40 motor oil. This oil type is versatile and provides excellent protection under different operating conditions.

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Importance of Using Recommended Oil

Using the recommended oil type is vital for several reasons. First, SAE 10W40 motor oil has the right viscosity to provide sufficient lubrication under a wide range of temperatures. This helps to reduce friction and wear on the engine’s moving parts, extending its lifespan. Additionally, this oil type contains additives that help keep the engine clean, preventing the build-up of sludge and other deposits that can impair performance. Lastly, using the correct oil ensures that your engine operates efficiently, which can lead to better fuel economy and more reliable performance.

Pump Oil

Capacity and Recommendations

The typical capacity for pump oil in DeWalt pressure washers is around 14 ounces. This capacity can vary slightly depending on the model, so it is always a good idea to consult your user manual for the exact specifications. When it comes to choosing the right oil for your pressure washer pump, there are two main options: DeWalt DP70 pump oil and SAE 30W non-detergent oil.

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DeWalt DP70 Pump Oil

DeWalt DP70 pump oil is specifically designed for use in pressure washer pumps. This oil is formulated with rust inhibitors, anti-foaming agents, and other additives that enhance pump performance and longevity. Rust inhibitors help to prevent corrosion, which can be particularly important in high-moisture environments where pressure washers are often used. Anti-foaming agents ensure that the oil maintains consistent lubrication without generating foam, which can compromise lubrication efficiency.

SAE 30W Non-Detergent Oil

As an alternative, SAE 30W non-detergent oil is also acceptable for use in DeWalt pressure washer pumps. This oil type is suitable because it has the right viscosity to provide adequate lubrication under the operating conditions typical for pressure washer pumps. Non-detergent oils do not contain additives that can hold contaminants in suspension, which is suitable for applications where oil is changed frequently and contaminants can settle out of the oil.

Safety Precautions (Optional)

When handling oils, it’s important to follow safety precautions to protect yourself and the environment. Always consult the user manual for your specific DeWalt pressure washer model to ensure you are using the correct oil type and quantity. Wear gloves to protect your skin from prolonged contact with oil, which can be irritating. Additionally, dispose of used oil responsibly by taking it to a recycling center or a facility that accepts used oil.


Using the correct type and quantity of oil for both the engine and pump of your DeWalt pressure washer is essential for maintaining its performance and extending its lifespan. Proper oil maintenance helps to ensure that your pressure washer operates efficiently and reliably, reducing the risk of breakdowns and costly repairs. By following the recommendations outlined in this article, you can keep your DeWalt pressure washer running smoothly and effectively for years to come.

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