How to Change Honda TRX300 Oil

Clean oil keeps an engine running smoothly, and is an essential ingredient for basic Honda ATV maintenance. 

Watch the video above and follow the steps below to change the oil in a TRX300 Honda ATV.

Tools and Supplies - Honda TRX300 Oil Change


Honda GN4 10W-40 oil

Honda ATV oil filter


Changing the Oil on a Honda TRX300

Step 1. Crank up the engine and run it for a couple of minutes to warm up the oil. 

PRO TIP: The heat will thin the oil, making it easier to drain.  

Step 2. Turn the engine off and remove the dipstick. 

Honda TRX300 oil change service

Step 3. Locate the drain bolt underneath the unit to drain the engine. Get a drain pan underneath and remove the bolt using a 17mm socket.

NOTE: Be extra careful not to lose the crush washer on the drain bolt.  

Honda TRX 300 oil change drain bolt

Step 4. Reinstall the drain bolt with the crush washer, and use a torque wrench to tighten it to 18 foot-pounds.

Step 5. Remove the oil filter cover by taking off the three 8mm bolts holding it in place. 

Honda TRX 300 oil filter cover

Step 6. Remove the oil filter.  

Honda TRX300 ATV oil filter change

Step 7. Clean the inside of the oil filter compartment with a rag. 

Honda ATV oil filter change

NOTE: Don't lose the spring at the back, which needs to stay in place.  

Step 8. Install the new oil filter

Honda TRX 300 oil filter change

NOTE: The oil filter is directional, and the black grommet should be facing you when you install it.

Step 9. Replace the oil filter cover, and use an 8mm socket to tighten down the bolts.

Honda TRX ATV oil filter change

PRO TIP: There's no specified torque here, but you don't want to overtighten them. 

Step 10. Fill the engine with motor oil.

Honda TRX300 ATV oil change refill

NOTE: Honda specifies that the TRX300 engine takes 2.4 quarts of GN4 10W40 oil

Step 11. Replace the dipstick, then run the engine for a minute or two to circulate the oil and check the level. To do this, remove the dipstick, wipe off the oil, and then place the dipstick on the crankcase without screwing it down. Top off the oil if necessary and you're done. 

Honda TRX300 oil change level dipstick

The steps for changing the oil on a Honda ATV are the same or similar for all models. However, if you want to see this job performed on a different model, watch the Honda Rancher 350 oil change video below. 







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