What Kind of Oil Does a Pressure Washer Use? A Complete Guide

 

If you're maintaining a pressure washer, one of the essential tasks is ensuring it has the right oil. The oil you use plays a crucial role in keeping both the engine and the pump running smoothly. But what kind of oil does a pressure washer use? The answer depends on whether you're talking about the engine or the pump, as well as the type of pressure washer you have—gas or electric. In this guide, we’ll walk through the different oils needed for pressure washers and provide tips for oil changes and proper maintenance.

1. Oil for Pressure Washer Pumps

Not everyone realizes that many pressure washer pumps need oil maintenance to function properly. The pump oil ensures the internal components run smoothly and prevents overheating. While not all pressure washers require pump oil changes, heavy-duty electrical models and gas-powered models typically have serviceable pumps that require regular pump oil maintenance.

Common Types of Pump Oil:

• 85W-90 (or 80W-90) GL4/GL5 Gear Oil: Heavy-duty commercial-grade electric pressure washers may have an oil chamber between the pump and motor which is designed to be accessible for regular oil change service. While Active pressure washers use 85W-90 gear oil, non-Active users should consult their manuals to confirm what gear oil is recommended.
• Non-Detergent Pump Oil (SAE 30): Most pressure washers with an oil-lubricated pump require non-detergent oil. Non-detergent oil is crucial because detergent oils can cause foaming and damage to the pump.
• Synthetic Pump Oil: For higher-end models, synthetic pump oil can provide better performance and longer life for the pump. It also holds up better in extreme temperatures.

Important Note: Never use standard engine oil in the pump. The pump requires a special type of oil specifically designed for high-pressure use.

 

2. Types of Oil for Pressure Washer Engines

For gas-powered pressure washers, the engine requires motor oil to lubricate its moving parts. This oil is similar to what you'd use in a car, but it’s essential to choose the right type based on your environment and the engine’s specifications.

Common Types of Engine Oil:

• SAE 30 Oil: This is a standard oil used in most small engines, including pressure washers. It's perfect for warmer climates and temperatures above 40°F (4°C).
• SAE 10W-30: If you use your pressure washer in varying temperatures, SAE 10W-30 oil is more versatile. It can handle both cold and warm temperatures, providing better performance when the weather fluctuates.
• Synthetic Oil: Some pressure washer engines can also use synthetic oil, which offers better protection, especially in extreme temperatures. Synthetic oils tend to last longer and provide better lubrication.

Pro Tip: Always refer to your pressure washer’s user manual to confirm the recommended type of engine oil for your specific model. 

3. How Often Should You Change Pressure Washer Oil?

The frequency of oil changes depends on how often you use the machine and the type of oil you're using.

• Pump Oil: The recommended frequency for pump oil will depend on the make and manufacturer, so it is best to refer to the manual or product FAQs. For instance, with Active's commercial-grade pressure washers, the first oil change should come after 25 hours of use, then every 100 hours after that (or 6 months - whichever comes first).
• Engine Oil: For gas-powered models, it’s best to change the engine oil after the first 5 hours of use (for a new machine), and then every 50 hours of use or once a season.

 

4. How to Change the Oil in a Pressure Washer

Regular oil changes are vital for keeping your pressure washer running smoothly.  Both the engine and pump oil need to be changed periodically to prevent build-up, ensure proper lubrication, and extend the life of the machine.

How to Change Engine Oil:

1. Warm Up the Engine: Run the pressure washer for a few minutes to warm up the engine. This makes the oil easier to drain.
2. Turn Off the Engine: Always turn off the engine and disconnect the spark plug for safety.
3. Drain the Oil: Use an oil drain pan. Locate the oil drain plug beneath the engine and remove it, allowing the oil to flow into the pan. If your model doesn’t have a drain plug, you can tilt the pressure washer to pour out the oil through the oil fill hole.
4. Refill with New Oil: Replace the drain plug, and refill the engine with fresh oil (according to your washer’s manual), typically SAE 30 or 10W-30. Use a funnel for precision.
5. Check the Oil Level: Use the dipstick to ensure the oil level is correct—neither too low nor too high.

How to Change Pump Oil:

1. Turn Off and Cool Down: Make sure the pressure washer is off and the pump has cooled down.
2. Determine How to Access Pump Oil Chamber: Depending on your model, you may need to remove the oil-fill and drainage plugs, or you may need to remove the piston plate that covers the oil chamber.
3. Drain the Oil: Tilt the machine or to pour out the oil into an oil pan. Once drained, be sure to wipe off any spilled oil from the machine.
4. Refill with New Oil: Refill with oil as recommended by the manufacturer. Don’t overfill.

If you're an Active customer, find the playlist for your pressure washer on our YouTube channel for video guidance on pump oil changes.

 

Conclusion

Choosing the right oil for your pressure washer is essential for smooth operation and longevity. Whether it’s the engine or the pump, the type of oil you use will make a big difference in performance. Remember to always check your manual for specific recommendations, and perform regular oil changes to keep your pressure washer in top shape.

Whether you own a pressure washer from Active or another brand, following these tips will ensure that your machine runs efficiently for years to come. Keep it maintained, and it will keep delivering the power you need!