Are you struggling with a pressure washer that’s not performing as it should? Perhaps you’ve noticed a drop in pressure or strange noises coming from the pump. If so, you’re not alone. Many pressure washer owners are left wondering how much oil should be in their pressure washer pump to keep it running smoothly.
The optimal amount of oil for a pressure washer pump is typically indicated in the user manual or on the pump itself. It’s crucial not to overfill the pump with oil, as this can lead to leaks and cause damage to the internal components. Under-filling can also cause problems, so it’s best to follow the manufacturer’s recommendations closely.
In this blog, we’ll explore the importance of maintaining the correct oil levels and provide you with all the information you need to keep your pressure washer operating at its best.
Types of Pressure Washer Pumps

Understanding the differences between the various types of pressure washer pumps is crucial for selecting the right equipment for your cleaning needs. Following are the different types of pressure washer pumps, including their pros and cons, and which tasks they are best suited for.
Wobble plate pumps
Wobble plate pumps are a type of pressure washer pump that use a circular plate to generate pressure. These pumps are commonly used in residential and light commercial applications, and are known for their low cost and high efficiency.
They work by rotating the plate at high speeds, which creates a reciprocating motion in the pistons that generates pressure. Wobble plate pumps are often less durable than other types of pumps, but they are also less expensive and easier to repair.
They are a good choice for homeowners and DIYers who need a reliable and affordable pressure washer pump.
Axial cam pumps
Axial cam pumps are a type of pressure washer pump that use a rotating plate with angled blades to create pressure. They are commonly used in residential pressure washers and are known for their compact size and efficiency.
Axial cam pumps typically operate at lower pressures than other types of pumps, but they can still deliver significant cleaning power. They are also relatively low maintenance and can be repaired easily if they do break down.
However, they are not as durable or long-lasting as some other types of pumps, and may not be suitable for heavy-duty use.
Triplex plunger pumps
Triplex plunger pumps are one of the most common types of pressure washer pumps. They are known for their high-pressure output and durability, making them ideal for heavy-duty applications.
Triplex plunger pumps have three plungers that are driven by a crankshaft, which creates a smooth and consistent flow of water. These pumps can operate at high pressures, typically ranging from 3000 to 5000 psi, and are capable of producing a high volume of water.
Triplex plunger pumps are commonly found in commercial and industrial pressure washers, and they require regular maintenance to ensure their longevity and performance.
Identifying the Correct Oil Type

Oil helps to lubricate the pump’s internal parts, preventing wear and tear and ensuring that it runs smoothly. However, not all oils are created equal, and using the wrong type of oil or the incorrect amount can cause serious damage to your pump.
Below, we are discussing how to identify the correct oil type for your pressure washer pump, so you can keep it running at peak performance.
Manufacturer recommendations
When it comes to selecting the correct oil for your pressure washer pump, follow the manufacturer’s recommendations. Each pump is designed differently, and the type of oil required may vary depending on the make and model of your machine.
Always consult your owner’s manual or contact the manufacturer directly to determine the appropriate oil type and viscosity for your pump. Using the wrong oil can cause damage to your pump and shorten its lifespan, so it’s crucial to follow these recommendations carefully.
Differences between pump oil and engine oil
Pump oil and engine oil are two different types of lubricants used in pressure washers. Pump oil is specifically designed for the high-pressure pump, while engine oil is used to lubricate the engine.
One of the main differences between pump oil and engine oil is their viscosity. Pump oil has a thicker viscosity than engine oil, which allows it to withstand the high-pressure output of the pump. Engine oil, on the other hand, is designed to flow easily throughout the engine.
Another difference is their additives. Pump oil contains additives that help it to resist foaming, corrosion, and oxidation. Engine oil, on the other hand, contains additives that help to keep the engine clean and reduce wear.
Use the correct type of oil for your pressure washer pump and engine to ensure optimal performance and longevity. Using the wrong type of oil can lead to damage and costly repairs. Consult your pressure washer’s manual or manufacturer’s website to determine the appropriate type of oil for your specific model.
Synthetic vs. Mineral oil
When it comes to pressure washer pump oil, there are two main types: synthetic and mineral oil. Synthetic oil is made from chemical compounds, while mineral oil is derived from crude oil.
While both types of oil can work in pressure washer pumps, synthetic oil is generally preferred due to its superior performance in extreme temperatures and its ability to resist breakdown under high pressure. Synthetic oil typically lasts longer than mineral oil, meaning you won’t need to change it as frequently.
Note that not all pressure washers are compatible with synthetic oil. Before switching to synthetic oil, check your owner’s manual to ensure it’s safe to use. If you’re not sure which type of oil is best for your pressure washer, consult with a professional or the manufacturer for guidance.
How Much Oil to Use in Pressure Washer Pumps

One crucial aspect of pump maintenance is oiling, which helps lubricate the internal parts and reduce friction, preventing wear and tear. Here is everything you need to know about the proper amount of oil to use in your pressure washer pump, including why it’s important, how to check the oil level, and how often to change the oil.
Factors affecting oil quantity
When it comes to the quantity of oil to use in pressure washer pumps, there are several factors to consider. These factors include the size and type of the pump, the operating temperature of the pump, and the frequency and intensity of use.
Using the appropriate amount of oil in the pump will ensure optimal performance, prevent damage to the pump, and extend its lifespan. Refer to the manufacturer’s instructions or consult with a professional to determine the appropriate amount of oil to use in your specific pressure washer pump.
Guidelines for different pump types
The guidelines for different pump types in pressure washers refer to the recommended amount of oil to use in each type of pump. The amount of oil required can vary depending on the pump’s design and size. Follow the manufacturer’s guidelines to ensure optimal performance and avoid damage to the pump.
Some common types of pumps include axial pumps, triplex pumps, and wobble pumps, each with their own recommended oil levels.
Axial pumps typically require less oil than triplex pumps, while wobble pumps may not require any oil at all. Refer to the owner’s manual for specific instructions on how much oil to use for your pressure washer pump.
Checking and maintaining oil levels
When using a pressure washer, check and maintain the oil levels in the pump regularly. This ensures that the pump runs smoothly and prevents damage to the engine. To check the oil level, locate the oil dipstick on the pump and remove it to check the oil level.
If the oil level is low, add oil to the pump until it reaches the recommended level. It is recommended to change the oil every 50 hours of use or at least once a year. Always refer to the manufacturer’s instructions for the type and amount of oil needed for your specific pressure washer pump.
Oil Change Intervals for Pressure Washer Pumps

Over time, the oil can break down and lose its effectiveness, reducing the pump’s performance and potentially causing damage. Therefore, change the oil in your pressure washer pump at regular intervals to maintain optimal performance and prolong the pump’s lifespan.
Following are the recommended oil change intervals for pressure washer pumps and provide some tips on how to properly maintain your pump’s oil.
Importance of regular oil changes
Regular oil changes are crucial for maintaining the optimal performance and lifespan of a pressure washer pump. Over time, dirt and debris can build up in the oil, causing it to thicken and lose its lubricating properties. This can lead to increased friction and wear on the pump’s components, which can result in decreased efficiency and even pump failure.
By changing the oil at regular intervals, you can help ensure that your pressure washer pump stays running smoothly and efficiently. Most manufacturers recommend changing the oil after the first 50 hours of use, and then every 100 hours or so thereafter. However, consult your owner’s manual for specific recommendations for your particular model.
Regular oil changes also provide an opportunity to inspect the pump for any signs of damage or wear. By catching problems early on, you can avoid more costly repairs down the line and extend the life of your pressure washer pump.
In summary, regular oil changes are an important aspect of pressure washer maintenance and can help ensure that your pump runs smoothly and efficiently for years to come.
Manufacturer-recommended intervals
Manufacturer-recommended intervals for oil changes in pressure washer pumps vary depending on the brand and model of the equipment. However, as a general guideline, it is recommended to change the oil every 50 to 100 hours of use or at least once a year, whichever comes first.
Follow the manufacturer’s recommendations to maintain the performance and lifespan of the pressure washer pump. Neglecting to change the oil at the recommended intervals can result in decreased efficiency, overheating, and damage to the pump’s internal components.
Signs that an oil change is needed
- One of the most common signs that an oil change is needed for a pressure washer pump is the appearance of metal shavings or particles in the oil.
- Another sign is when the oil becomes discolored or murky, indicating that it has become contaminated with dirt or other debris.
- A decrease in pressure or performance can also indicate the need for an oil change, as dirty or degraded oil can affect the pump’s ability to function properly.
- Additionally, unusual noises or vibrations coming from the pump can be a sign that the oil needs to be changed, as these can be caused by worn or damaged pump components due to insufficient lubrication.
- It’s important to follow the manufacturer’s recommendations for oil change intervals to ensure proper maintenance and prolong the life of the pressure washer pump.
Changing the Oil in Pressure Washer Pumps
To keep your pressure washer running smoothly and efficiently, it’s essential to perform regular maintenance, including changing the oil in the pump. Below is a closer look at why changing the oil in pressure washer pumps is important, how often it should be done, and the steps you need to follow to do it correctly.
Preparing the pressure washer
Preparing the pressure washer is an essential step before changing the oil in the pressure washer pump. It involves shutting off the machine, releasing pressure from the pump, and draining the old oil. This step ensures that the oil change is done safely and effectively, and it helps prevent damage to the pump and other components of the pressure washer.
Step-by-step oil change process
The process of changing oil in a pressure washer pump is relatively simple and can be done in just a few steps. First, you’ll need to gather the necessary tools and equipment, including a new bottle of oil, a funnel, and a container to catch the old oil.
Next, you’ll need to locate the oil cap and drain plug on the pump and remove them using a wrench or pliers. Once the old oil has drained out, you can replace the drain plug and add the new oil using the funnel. Use the correct type and amount of oil for your particular pump, which can be found in the manufacturer’s instructions or on the pump itself.
After adding the new oil, replace the oil cap and run the pump for a few minutes to ensure the oil is distributed evenly throughout the system. By following these steps, you can ensure that your pressure washer pump is properly lubricated and functioning at its best.
Disposing of used oil responsibly
When changing the oil in a pressure washer pump, dispose of the used oil responsibly. Used oil can contain contaminants that are harmful to the environment and human health, so it should not be poured down the drain or disposed of in the regular trash.
Instead, it should be taken to a local recycling center or an authorized collection facility for proper disposal. Some auto parts stores and service stations may also accept used oil for recycling. By disposing of used oil responsibly, we can help protect the environment and promote a sustainable future.
Conclusion
The amount of oil required in a pressure washer pump varies depending on the make and model. It is essential to refer to the manufacturer’s instructions to determine the appropriate amount of oil. Overfilling the pump with oil can damage the seals, while under-filling can cause the pump to run hot.
As we come to the end of this discussion on the amount of oil in pressure washer pumps, let’s take a moment to recap the key takeaways from this topic. We have learned that the amount of oil in the pump plays a crucial role in its proper functioning and performance. Overfilling or underfilling the oil can lead to various issues like decreased pressure output, pump damage, and decreased lifespan.
Remember that proper oil management is critical for the long-term health and performance of your pressure washer pump. Regularly checking the oil levels and using the recommended type and amount of oil will ensure that your pressure washer operates at its peak efficiency and lasts for years to come.
In conclusion, understanding the importance of oil management in pressure washer pumps and taking the necessary steps to maintain the appropriate oil levels is crucial for the proper functioning and longevity of your machine. By following these guidelines, you can save yourself time, money, and unnecessary hassle in the long run.