How to change the oil in a 2015 Honda CRF450X Dirt Bike

How to Change the Oil in a 2015 Honda CRF450X

Shop parts for a 2015 Honda CRF450X Dirt Bike.

Changing the oil on your 2015 Honda CRF450X is a vital maintenance task to ensure a long, healthy life for your motorcycle’s engine and transmission. This step-by-step guide written exclusively for MotoSport.com will walk you through the process and highlight specific details about the CRF450X that every owner should know. You can accomplish this service in under an hour with basic tools in your garage.

Tools and Supplies Needed

• 8mm and 10mm sockets
• Ratchet
• 10mm Allen wrench
• Oil drain pan
• Clean rags or paper towels
• Torque wrench (inch-lbs and Nm preferred)
• Honda OEM or compatible oil filter
• Honda 20W-50 or OEM-recommended oil (for your climate/conditions)
• New crush washers or sealing washers for the drain bolts
• Replacement O-ring for the oil filter cover (if needed)
• Funnel

2015 CRF450X Model-Specific Call-Outs

• The 2015 CRF450X has separate engine and transmission oil compartments. Two drain bolts and two separate fill procedures are required. The transmission side is more commonly overfilled by cautious owners, with consensus favoring about 950ml (1 quart) vs. the 750ml in the manual for extra protection.
  (source: )
• The engine oil drain bolt (with sealing washer) is located on the left (stator) side of the crankcase.
• The transmission oil drain bolt is found behind the shifter lever.
• The oil filter cover has two different-length bolts. Note their locations when removing to avoid confusion during reassembly.
  (source: )
• Be gentle when removing filter cover bolts—they are easily stripped. Never over-torque the cover bolts or you risk damaging the case threads.
• Always torque drain bolts to 16 Nm (about 12 ft-lbs) and oil filter cover bolts to a maximum of 10 Nm.

Step-By-Step Instructions

• Warm up your motorcycle. Let the engine idle for a few minutes to thin the oil, ensuring a more complete drain.
  (source: )
• Remove skid plate or engine guard if equipped, for access to drain bolts and the oil filter cover.
• Place your drain pan under the CRF450X.
• Remove the engine oil drain bolt from the stator side and allow oil to drain thoroughly. Replace the crush washer if necessary.
• Remove the transmission oil drain bolt behind the shift lever and let the transmission oil drain. Again, replace the crush washer.
  (source: )
• Remove the oil filler caps for both the engine and transmission to improve drainage.
• Remove the oil filter cover using the correct socket. Observe the locations of the bolts—one is longer than the other(s).
• Remove the old oil filter and filter spring. Inspect for debris or metal filings, which could warn of engine issues.
  (source: )
• Clean the oil filter cover. Replace the O-ring seal if cracked or deformed.
• Install the new oil filter and spring in the correct orientation.
• Reinstall the filter cover. Torque the bolts to no more than 10 Nm.
• Reinstall engine and transmission drain bolts with new crush washers. Torque each to 16 Nm (about 12 ft-lbs).
• Fill new engine oil and transmission oil.
  
  • For the engine: Add Honda 20W-50 (or specified) oil. The CRF450X typically holds about 0.8L to 1.0L in the engine (consult your manual).
  • For the transmission: Many owners recommend 950ml (1 quart) for extra lifespan, higher than the manual’s 750ml.
    (source: )
• Replace oil filler caps.
• Start the bike and let it idle for 3–5 minutes. Check for leaks.
• Let the bike rest 2–3 minutes. Check oil levels with the sight glass or dipstick, and top off as needed.
  (source: )
• Reinstall the skid plate or engine guard if you removed it.

Best Practices and Expert Tips

• Change the oil and filter every 15 engine hours or 6 races, whichever comes first.
  (source: )
• Always use a fresh crush washer on each oil change to prevent leaks.
• Inspect used oil and the filter for metallic debris—a sign of abnormal engine wear.
• Tighten bolts by hand until seated before torquing, and only to the specified value.
• Be patient when filling to avoid airlocks and overfilling.
• Print or save a small maintenance log with each oil change record for resale value and engine longevity.

Conclusion

Regular oil changes using correct methods and tools are the best way to maximize the life and performance of your 2015 Honda CRF450X. Following these steps at the recommended interval keeps your engine and gearbox running smooth whether you’re on the track or trail. Have questions? MotoSport.com’s experts and community are here to help you ride further and wrench smarter.

Related Shopping Categories

Shop Motor Oil for a 2015 Honda CRF450X Dirt Bike.

Shop Oil Filters for a 2015 Honda CRF450X Dirt Bike.

Shop Oil Drain Pans for a 2015 Honda CRF450X Dirt Bike.

Shop Tools for a 2015 Honda CRF450X Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2015 Honda CRF450X Dirt Bike.

Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.