How to Change Motor Oil on a DeWalt Pressure Washer

Your DeWalt Pressure Washer is a powerhouse tool designed for optimal performance. However, to ensure it runs smoothly and efficiently, regular maintenance is essential. One of the fundamental steps in this upkeep regimen is the oil change.

This guide will walk you through the process, making sure your machine continues to operate at its best for years to come.

Step-by-Step Guide to Changing The Oil On Your DeWalt Pressure Washer

What You Will Need To Complete The Job

Wrench to undo the drain
Container to hold the used motor oil
Motor oil 10W-30 (automotive engine oil)
PVC pipe for the machine with no drain
Cleanup rags

Step 1: Warm-Up

Begin by starting the engine. Let it run for a short while, warming up the oil. This makes the oil less viscous, ensuring a smoother and more complete draining process.

Step 2: Drain the Old Oil

Firstly, locate the drain plug at the base of the engine block. With an oil catch pan ready beneath the washer, remove both the oil filler cap and the drain plug. The removal of the filler cap helps alleviate any vacuum created by the outgoing oil, facilitating a quicker drain.

Step 3: Clean and Replace

Once the oil has fully drained from the reservoir, it’s time to clean. Wipe off any spilled or residual oil from the engine and the body of the pressure washer. Following this, securely replace the drain plug.

Step 4: Refill with Fresh Oil

Pour in 1.2 U.S. quarts of SAE 10W30 or SAE 10W40 engine oil into the reservoir. This specific oil type offers versatility, catering to a broad range of operating temperatures.

I’d recommend something like Pennzoil Conventional 10W-30 Motor Oil.

Read more about the best oil for DeWalt pressure washers here.

Step 5: Seal the Deal

Once you’ve refilled the engine, ensure you place back the oil plug or dipstick, sealing the reservoir.

Step 6: Address the Pump

Now, direct your attention to the pump oil plug. With another catch pan (or after cleaning the first one), position it beneath the pump’s drain area. Then, gently loosen the pump oil plug.

Step 7: Drain the Pump Oil

Remove the pump’s drain plug, allowing the old oil to flow out and into the catch pan.

Step 8: Secure the Plug

After ensuring all the old oil is out, replace and securely tighten the pump’s drain plug.

Step 9: Refill the Pump

Remove the pump oil plug or dipstick and begin filling the reservoir. Pour in 14 oz. of DP70 pump oil or, alternatively, use SAE 30W nondetergent oil. While refilling, periodically check the glass window on the pump housing. Ideally, the oil level should align with the middle dot in this window.

Step 10: Final Touches

Once filled, replace the pump oil plug or dipstick, ensuring it’s securely in place.

How Often Do I Need To Change The Oil on My DeWalt Pressure Washer?

You should change the oil on your pressure washer every 3 to 5 months. This all depends on how often you use it.

If you use it all the time for your job or business, then this would equate to every 40 to 50 hours of use.

You need to keep the oil change routine consistent in order to keep your pressure washer equipment running smoothly, safely and efficiently.

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