How to Change the Oil in a 2021 GAS GAS MC 450F

Shop parts for a 2021 GAS GAS MC 450F Dirt Bike.

Changing the engine oil in your 2021 GAS GAS MC 450F is a critical maintenance task that keeps your engine running strong and extends the longevity of vital components. This guide—made proprietary to MotoSport.com—details tools needed, step-by-step instructions, and special considerations unique to this model and year.

Tools and Supplies Needed

  • 1.2 liters Motorex Cross Power 4T 10W/50 full synthetic oil (OEM recommended spec for MC 450F)
  • OEM oil filter
  • Oil drain bolt crush washer
  • Drain pan
  • 10mm and 13mm sockets or T-handles
  • 5mm Allen wrench
  • Contact cleaner or degreaser spray
  • Rags or shop towels
  • Rubber gloves
  • Measuring cup (for precise oil fill)
  • Pliers (for oil filter removal if needed)
  • Motorcycle stand compatible with MC 450F (avoid stands that block the drain bolt area)
  • Safety glasses

Preparations

  • Start the engine and let it idle for several minutes to warm up the oil—this helps thin the oil for complete draining. Ensure the bike is in a well-ventilated area.
  • Turn off the bike and allow it to cool so you avoid burns, particularly from hot engine cases or oil.
  • Place your MC 450F on a stand that allows clear access to the drain plug (do not use floor stands that block the engine’s bottom).
  • Gather all your tools and supplies within arm’s reach.

Step-by-Step: Changing the Oil

  1. Remove Skid Plate (if installed): If your MC 450F is equipped with a skid plate, use the appropriate Allen or socket tool to remove it for complete access to the oil drain plug and screens.
  2. Clean the Area: Wipe down the area around the oil drain plug and filter covers to prevent dirt from entering the engine during the oil change.
  3. Remove the Oil Drain Bolt: Position your oil drain pan directly under the crankcase. Use the 13mm wrench to remove the drain bolt from the bottom of the engine and let the oil drain completely.
  4. Remove and Clean Oil Screens (if present): The MC 450F uses oil screens as well as an oil filter to trap debris. Locate the oil screens (refer to owner’s manual) and remove them using a 10mm tool. Inspect and clean the screens with contact cleaner then reinstall them.
  5. Remove Oil Filter: Use an 8mm T-handle or socket to remove the two bolts securing the oil filter cover. Carefully pull the old filter out (use pliers if necessary). Inspect the cover O-ring and replace if damaged.
  6. Install New Oil Filter: Insert a new OEM filter in the proper orientation. Reinstall the oil filter cover and torque the bolts evenly.
  7. Install New Crush Washer – Drain Plug: Replace the drain bolt’s crush washer with the new one from your kit. Hand thread the drain plug and torque to manufacturer specs (do not overtighten).
  8. Fill with Oil: Remove the oil fill plug on top of the engine. Pour in 1.2 liters of Motorex Cross Power 4T 10W/50 oil—use a funnel and measuring cup for accuracy. Replace and tighten the oil cap.
  9. Check Oil Level: Start the engine and let idle for one minute. Shut off and allow it to sit for a few minutes. Check the oil sight glass or dipstick for proper level and top off if needed.
  10. Check for Leaks: Inspect the drain bolt, oil filter cover, and fill plug for any signs of oil leakage. Tighten or correct as needed.
  11. Dispose of Old Oil – Filter: Bring used oil and filter to a local recycling center or auto parts store that accepts motorcycle fluids.

2021 GAS GAS MC 450F Specific Call-Outs

  • Oil Capacity: 1.2 liters is the correct fill for this year; ensure you do not overfill as this can cause excessive crankcase pressure and leaks.
  • Drain Plug Location: Ensure no stand or debris obstructs direct access to the drain plug under the engine case, as the MC 450F’s compact frame can make this area tight.
  • Oil Filter Orientation: The filter must seat fully into its housing. If the O-ring is pinched, leaks can occur.
  • OEM Parts Recommended: Using non-OEM oil filters or washers can result in poor fitment or leaks. Always use approved filters and washers provided in MC 450F-specific kits.
  • Draining Both Screens: This engine uses oil screens besides the regular oil filter; both must be removed and cleaned at every oil change.

Additional Pro Tips

  • Slightly lean the bike side-to-side with both wheels on the ground after removing the drain plug—this helps evacuate trapped oil pockets in the engine.
  • Never ride the MC 450F if the oil level is below minimum; internal damage can occur rapidly.
  • If you ride in very dusty or muddy conditions, change your oil and filter more frequently to maintain engine life.

With these steps and model-specific notes, your 2021 GAS GAS MC 450F will be ready for the track or the trail—performing at its peak every time.

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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.