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Best Oils for Pressure Washers

A pressure washer is an effective tool for deep cleaning concrete structures, stone pavements, walls, and vehicles. If you’ve bought one to streamline your domestic cleaning jobs, you should also know about its maintenance regimen to keep using it in its pristine condition and extend its operating life.


In a Hurry? Here are Our Top Choices


Even though contemporary pressure washers are low-maintenance, you still need to regularly replace their oil for providing lubrication to the pump’s internal parts. A well-oiled gas pressure washer experiences minimal internal friction and consequently faces less wear and tear.


If you’re confused regarding the pump oil that’ll go into your pressure washer, keep reading this article. Here, we’ve researched, shortlisted, and reviewed five of the best oils for pressure washers available in the market right now.


1. Briggs & Stratton 6033 Synthetic 75W90 Oil for Pressure Washer Pump

Briggs & Stratton is a reputable name among generators and pressure washer manufacturers. It has also developed a high-endurance oil formula for pressure washers suitable for all brands that use Triplex pumps.


This oil exhibits a higher viscosity rating, ensuring it doesn’t thin out at higher operating temperatures. We also like this pressure oil bottle for its fill-neck construction that lets you easily pour the oil into the washer without creating any mess.



  • Comes in a handy 15-oz bottle
  • High-endurance formula
  • Suitable for a range of gas pressure washers



  • Some may find it a bit expensive


2. Mi T M AW-4085-0016 Power Washer Pump Oil

Mi-T-M makes pressure washers and industrial cleaning equipment. It has also introduced pump oil for pressure washers. The best thing about this pump oil is that it’s not just meant for Mi-T-M manufactured models. You can also use it with a range of other pressure washer brands.


The oil comes in a handy 1-pint bottle sporting a long neck. You can easily grip the bottle and pour the oil into the pump without spilling a drop. We’ve also shortlisted this pressure washer oil for its economical price tag that is far lower than many oil brands with similar composition.



  • Versatile oil works for a range of washer brands
  • Great bang for the buck
  • Proven lubrication quality



  • Might not be suitable for some pressure washers

3. Mag 1 60694-6PK Pressure Washer Pump Oil

Mag 1 has put up an oil product with all the features you seek in exclusively made pressure washer oils. This 30-W oil formula has the perfect viscosity rating for both high and low temperatures. It also prevents foaming and aeration within the pump and protects its parts from rust.


Regular pressure washer oils usually don’t provide any sludge prevention and protection. That’s not the case with Mag 1 pressure washer oil. It prevents microscopic buildup within the pump to ensure no sludge formation. This washer oil is a bit expensive, but all its features are worth its price tag.



  • Comes in a handy 1-quart bottles
  • Can be used in air compressors as well
  • Ticks all the boxes



  • A bit heavy on the pocket


4. Generac 6656 Pressure Washer Pump Oil SAE 30, 20-Ounce

Generac is another pressure washer manufacturer that has introduced its propriety oil. You can use this oil in Generac as well as other pressure washer brands. The manufacturer has made it with an advanced additive technology to ensure your washer and pump can work in extreme conditions.


The use of Generac 6656 oil is particularly known for ensuring easy washer start-up with minimal friction and wear. The regular use of this oil will also protect your pressure washer from thermal breakdowns in the long run.



  • 20-oz bottle with a slim profile— easy to handle
  • Balanced viscosity rating
  • Great value for money



  • May not be suitable for some washers


5. General Pump 758-115 Pressure Washer Pump Oil

We’re rounding off our list with a product that is the most economical option on the block. General Pump offers a pack of six 16-ounce bottles of pressure washer oil within a price at which other manufacturers offer half of its quantity.


It’s important to mention here that the low price of General Oil has no bearing on its quality. It’s as good as any other pressure oil product available. It lubricates the pump, assists it in heat dissipation, and makes sure the pump doesn’t experience any impurity obstruction.



  • A great bang for the buck
  • Suitable for almost all pressure washer pumps
  • Also available in packs of one, two and, three



  • The construction of the bottle could’ve been better


Things to Consider While Buying Oil for Pressure Washer

When you’re shopping for oil for your pressure washer, consider these factors.



Viscosity defines the thickness of the oil. Pressure washer oil must have a moderate viscosity rating. It should neither be too thick or too thin. Make sure that the pressure washer oil you buy has the high-temperature viscosity in the range of 30-90W.



Don’t forget to read the label of the oil you’re selecting. Many people commit a mistake of picking regular engine oil for their pressure washers. Motor/engine oils contain magnesium sulfonate as a detergent additive, making their formula unsuitable for pressure washer pumps. Therefore, many manufacturers put “non-detergent formula” on their pump oils for pressure washers.


Instead of detergent, a top-of-the-line pressure washer oil contains anti-oxidation and anti-foaming agents.



You need to replace pressure pump oil in months or even a year. However, it doesn’t mean you don’t need to factor in the price of the oil. You can easily find any top-quality one quart of pressure pump oil within $20. If you’re paying more than that for the same quantity, you’re being ripped off.


Our Final Thoughts

We hope that the above reviews and buying guide will help you buy the best oil for your pressure washer. If you want us to make one suggestion, we’d recommend you buy Briggs & Stratton’s synthetic oil for its top performance and viscosity profile. You can also consider General Pump’s Oil Pack to get more quality oil at a lesser price.


About Chris

When Chris first bought a house, he quickly realized that he was now going to need to be a weekend handyman. Every project that he worked on, he kept realizing that he needed more and more DIY tools. Chris is also someone who likes to do a lot of research before making large purchases. Since he had already done most of the research, Chris decided to put the info that he accumulated about his favorite daily tools onto