How to change the oil in a 2012 Honda CRF450X Dirt Bike

How to Change the Oil in a 2012 Honda CRF450X

Shop parts for a 2012 Honda CRF450X Dirt Bike.

Changing the oil in your 2012 Honda CRF450X is a crucial maintenance step to keep your dirt bike performing at its peak and ensure engine longevity. This guide is specifically tailored for the CRF450X, covering engine and transmission oil, pointing out model-specific details, and is proprietary to MotoSport.com.

Tools and Supplies Needed

• Metric socket set (especially 12mm for drain bolts and 8mm for oil filter cover bolts)
• Torque wrench (measuring up to at least 20 Nm)
• Parts tray or magnetic dish for bolts
• Drain pan
• New OEM or aftermarket engine oil filter
• Two new drain plug crush washers
• Rags or shop towels
• Funnel
• Oil measuring cup
• Honda recommended oil (Engine: Pro Honda GN4, HP4 or HP4M with molybdenum, or equivalent, Transmission: Pro Honda HP trans oil or GN4/HP4 without moly; alternative oils listed below)

Oil Quantities and Specifications

• Engine oil with filter:– 0.74 US quarts (0.70 liters)
• Engine oil without filter:– 0.71 US quarts (0.67 liters)
• Transmission oil:– Honda specifies 0.69 US quarts (0.65 liters), but riders recommend a full quart (950 ml) for added protection
• Do not use synthetic oil for engine break-in. Run at least 200 miles with mineral oil before switching to synthetic if desired.

Alternative Oils Commonly Used by Owners (at own risk):

• Engine: Amsoil 10w-40, Maxima Extra Synthetic, Shell Rotella T Synthetic 5w-40
• Transmission: Amsoil 10w-40, Delo 400, Maxima MTL 80W, Motul Trans Oil 10w-40, Shell Rotella T Synthetic 5w-40

Step-by-Step Oil Change Instructions

• Warm the Engine:–
  • Start the bike and let it idle for 3-5 minutes to thin the oil for a complete drain.
  • Turn off the engine and let it cool slightly for safety.
• Secure Your Bike:–
  • Place the bike on a stand, ideally with an open center to catch draining oil.
• Drain the Engine Oil:–
  • Locate the engine oil drain bolt on the left crankcase cover (Stator side).
  • Remove the drain bolt and its crush washer; let oil fully drain into a pan.
  • Inspect the washer and replace it with a new one.
• Drain the Transmission Oil:–
  • The transmission drain bolt is behind the shift lever on the left side. Use care not to confuse it with the engine drain.
  • Remove the bolt and crush washer, allow oil to drain, then replace the washer with a new one.
• Remove and Replace Oil Filter:–
  • If equipped, remove the engine guard for better access.
  • Remove the oil filter cover bolts (note their positions – they may be different lengths).
  • Remove the cover and old filter. Check for metal debrisa sign of internal engine wear.
  • Remove and inspect the oil filter spring and cap O-ring. Replace the O-ring if tight or damaged.
  • Install the new filter with the open end facing outwards (engine side). Reinstall spring.
  • Button up the cover by hand and torque the bolts to 10 Nm; do not over-tighten as the threads are easily stripped.
• Reinstall Drain Bolts:–
  • Install both drain bolts with new washers. Torque to 16 Nm for each.
• Add Fresh Oil:–
  • Add the specified quantity of fresh oil to both the engine and transmission.
  • Fill the transmission through the fill port behind the shift lever until oil reaches the bottom of the overflow hole with the bike upright and level
  • Fill the engine at the filler cap on the left side until it reaches the high mark on the sight glass.
• Check for Leaks and Oil Level:–
  • Start the engine and let it run for a few minutes, then check for leaks at filter and drain plugs.
  • Re-check oil levels and add more if necessary.

2012 CRF450X Model-Specific Call-Outs

• Dual oil system:– The CRF450X uses separate engine and transmission oilsa unique feature for precise lubrication and easier diagnosis of internal problems. Make sure not to swap fluid types between systems or fill in the wrong ports.
• Drain plug locations:– Engine side drain is on the left stator case; transmission side drain is behind the shifter. This is true for all '04-’21 CRF450X models, but be vigilant as owners often confuse these plugs.
  Tip:– Mark the bolts if needed for future reference.
• Torque settings are critical:– The aluminum threads are easy to strip, so use a torque wrench and follow Honda specifications carefully.
• Transmission oil quantity:– Although Honda specifies 0.69 qt, the CRF450X enthusiast community often recommends using a full quart (950 ml) in the transmission for extra protection against high-heat riding and component wear. No failures have been reported with this practice, but always stay within reasonable limits for your riding style.
• Crush washers:– Always use new; reusing can lead to leaks or improper torque readings.
• Synthetic oil use:– Avoid synthetic oils for the first 200 miles on a new or rebuilt engine; use mineral-based oils for break-in.

Important Tips

• Change your oil and filter frequently—racing or hard trail use shortens oil life significantly.
• Keep your air filter clean and properly seated for maximum engine protection.
• Never overfill either side; too much oil can lead to high crankcase pressure and leaks.

Conclusion

Regular oil and filter changes are the single best maintenance investment you can make for your 2012 Honda CRF450X. By following these steps and paying careful attention to model-specific details, you'll keep your dirt bike running trouble-free on trails or the track.

Brought to you by MotoSport.com—Your One-Stop Shop for All Dirt Bike Parts and Maintenance.

Related Shopping Categories

Shop Motor Oil for a 2012 Honda CRF450X Dirt Bike.

Shop Oil Filters for a 2012 Honda CRF450X Dirt Bike.

Shop Oil Drain Pans for a 2012 Honda CRF450X Dirt Bike.

Shop Tools for a 2012 Honda CRF450X Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2012 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.