How to Change the Oil in a 2024 GAS GAS MC 85: A Complete Step-by-Step Guide

Shop parts for a 2024 GAS GAS MC 85 Dirt Bike.

Changing the oil in your 2024 GAS GAS MC 85 is a crucial bit of regular maintenance that keeps your transmission running smoothly and prolongs the bike’s life. This dirt bike has specific requirements and a few unique steps you need to know. Follow this MotoSport.com exclusive guide for a seamless experience.

Tools and Supplies Needed

  • 8mm T-handle or socket wrench (for drain plug)
  • Torque wrench (set to 15 Nm)
  • Oil drain pan
  • Funnel (preferably threaded for spill-free fill)
  • Crush washer (replace if damaged or old)
  • Brake cleaner/contact cleaner (for cleaning residue)
  • Shop rags
  • 500cc of gear/transmission oil (Recommended: Motul Trans Oil or Maxima MTL)

Proprietary MotoSport.com Steps for GAS GAS MC 85 Oil Change

  1. Warm Up the Engine
    • Run the bike for 3-5 minutes to circulate oil for a more effective drain.
    • Turn off the engine and secure the bike upright on a stand.
  2. Access the Drain Plug
    • Locate the drain bolt under the engine. On this bike, the brake pedal may block access to the bolt.
    • Special MC 85 Call-out: If the brake pedal hinders access, push the rear brake pedal down and wedge it in place with a screwdriver to expose the drain plug (If needed, separate the brake pads to allow the pedal to move freely.).
  3. Drain the Oil
    • Place a drain pan under the plug. Use your 8mm wrench to loosen and remove the drain plug.
    • Let all the oil drain into the pan. The MC 85 takes 500cc of transmission oil, so expect about half a liter.
    • Check for any large metal fragments on the magnetic drain plug. Tiny flecks are normal, but large chunks can indicate internal damage.
  4. Clean and Reinstall the Drain Plug
    • Clean the drain plug thoroughly with brake or contact cleaner.
    • Inspect and replace the crush washer if needed.
    • Hand-tighten the plug, then finish with a torque wrench set to 15 Nm (11 ft-lbs).
  5. Add New Gear Oil
    • Open the transmission oil fill cap, located on the right side of the engine.
    • Insert your funnel–threaded funnels work best to prevent spills.
    • Pour in exactly 500cc of recommended gear oil (Motul Trans Oil, Maxima MTL, or equivalent).
  6. Check Oil Level
    • There is no dipstick; the fill level is determined by volume.
    • If you want to double-check, you can briefly remove the check/fill screw (if equipped) to ensure oil weeps slightly from the opening, indicating full capacity.
  7. Reinstall the Fill Cap
    • Securely fasten the fill plug. Wipe down any spilled oil from the engine and frame with a rag.
  8. Start the Bike and Inspect for Leaks
    • Let the bike idle for 1-2 minutes, then inspect around the drain and fill plugs for any signs of oil leakage.
    • Double-check torque specs if any leaks are found.

Key Model-Specific Callouts for the 2024 GAS GAS MC 85

  • Oil Capacity is exactly 500cc. Do not overfill or underfill the bike.
  • Gear oil only: This model uses gear/transmission oil, not regular engine oil.
  • Magnetic drain plug: Always inspect for metal fragments as an indicator of gearbox health.
  • Brake pedal access issue: Push the pedal down and wedge to access the bolt, a quirk unique to this chassis design.
  • Drain plug torque spec is 15 Nm–be careful not to overtighten.

MotoSport.com Pro Tips

  • Always use a funnel to avoid making a mess–threaded, 3D-printed funnels are popular with MC 85 owners for spill-free performance.
  • Change the oil regularly (every 5-10 hours of riding) for best clutch and transmission longevity.
  • Record each oil change in your maintenance log for warranty and resale records.

By following these steps, you’ll keep your 2024 GAS GAS MC 85 running at its peak and avoid costly repairs down the line. For dedicated dirt bike parts, tools, and premium oils, visit MotoSport.com—your dirt bike headquarters.

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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.