How to Change Oil on Warrior 350

How to Change Oil on Warrior 350

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Changing the oil on a Yamaha Warrior 350 ATV requires you to access the oil tank, oil filter and oil fill tube underneath the seat and protective paneling over the engine block. Upon locating these components, the process of changing the engine oil on a Warrior 350 is similar to the process for changing the engine oil on most ATVs, which is itself similar to the process of changing the engine oil on most mechanical vehicles.

Items you will need

  • Wrench

  • Strap wrench

  • Replacement oil filter

  • 2 1/2 quarts of 10w40 engine oil

Park your Warrior 350 ATV in a flat place, and put wheel chocks behind the rear wheels and in front of the front wheels. This will ensure that the ATV will not roll while you change the oil.

Remove the seat and connected paneling. The seat of a Yamaha Warrior clips on, and the paneling covering the engine block can be accessed underneath the seat. Remove the paneling by unscrewing the bolts on other side with the loop end of a standard wrench.

Locate the oil drain plug at the bottom of the oil tank underneath the engine block. The drain plug is a small nut at the bottom-most part of the ATV.

Move an oil drain pan underneath the ATV such that the center of the drainage funnel is directly underneath the drain plug.

Unscrew the drain plug and allow the oil to drain from the oil tank.

Unscrew and remove the oil cap on the left side of the engine block. The cap is clearly marked with the image of an oil can. Removing the cap will speed up the oil draining from the tank.

Remove the old oil filter with a strap wrench. The oil filter is located on the left side of the engine block, directly above the oil tank.

Wipe up any oil that spilled onto the engine block from the oil filter with a clean cloth. If you do not clean up the oil, it will burn off the next time the ATV is running, creating noxious smoke.

Paint the connecting rim of a new oil filter with new engine oil. This will create a suction bond between the edge of the oil filter and the oil tank. It will also provide lubrication for the next time you remove the oil filter.

Attach the new oil filter and replug the bottom of the oil tank, making the oil fill tube the only open access to the tank.

Fill the oil fill tube with 2 1/2 quarts of 10w40 engine oil.

Turn the ATV on and let it idle for 10 to 15 minutes before driving the ATV.


  • Turn the Warrior 350 ATV on and let it run for 10 minutes prior to changing the oil if the outside air temperature is below 60 degrees Fahrenheit. Running the engine will thin the oil out enabling it to drain more smoothly from the tank.
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