How to Change the Oil in a 2025 GAS GAS MC 65

Shop parts for a 2025 GAS GAS MC 65 Dirt Bike.

Changing the oil in your 2025 GAS GAS MC 65 is an essential maintenance task that ensures your dirt bike runs smoothly and maintains longevity. Below is a step-by-step how-to guide, including the tools required and specific notes relevant to the MC 65 model year.

Tools and Materials Needed

  • 3/8″ drive ratchet
  • 3/8″ drive extension
  • 13mm socket (use a shallow socket for better fit behind the shifter)
  • Oil drain pan
  • Fresh oil: The 2025 GAS GAS MC 65 requires 15W50 gear oil
  • Measuring bottle or graduated container (to measure 500ml)
  • Clean rags
  • Replacement O-ring for the drain bolt (optional but recommended)
  • Torx T-wrench (if checking oil filter screen)
  • Bike stand that allows access to the drain plug
  • Protective gloves (optional)

Preparation

  • Warm up your bike for a few minutes to thin the oil, making it drain easier. Do not overheat the engine.
  • Turn the bike off and secure it on a stand that gives access to the underside and the left side, behind the shifter.

Steps to Change the Oil

  1. Locate the Drain Plug:
    • On the 2025 GAS GAS MC 65, the oil drain bolt is positioned on the left side, directly behind the shifter lever.
    • A shallow 13mm socket fits best here, reducing the need to remove the shifter itself.
  2. Place Oil Drain Pan:
    • Slide the oil drain pan under the drain area to catch old oil.
  3. Remove the Drain Plug:
    • With the bike upright, use your 13mm socket/ratchet (with extension if needed) to loosen and remove the drain bolt.
    • Let the old oil completely drain into the pan. Take care not to lose the drain bolt or O-ring.
  4. Inspect and Replace O-Ring:
    • Inspect the O-ring on the drain bolt for wear or damage. Replace with a new one if needed to prevent leaks.
  5. Clean the Area:
    • Wipe any grime from around the drain hole and the drain bolt with a clean rag. This helps prevent contamination when refilling.
  6. Reinstall the Drain Bolt:
    • Carefully thread the drain bolt back in by hand to avoid cross-threading. Tighten firmly (not overtightened—see your owner’s manual for a torque spec if available).
  7. Refill with Fresh Oil:
    • Remove the oil fill cap (usually on the left side of the engine, above the shifter).
    • Using a funnel and a measuring bottle, add 500ml of 15W50 gear oil, as specified for your model. (500ml = 0.53 US quarts)
    • Use only quality oil: GAS GAS recommends Motorex, but other premium brands like AMSOIL are suitable, as long as they meet the correct specification.
  8. Check Oil Level:
    • With the bike upright, use the sight glass or stick (if equipped). Top off if needed, but do not overfill.
  9. Check for Leaks:
    • Start the bike and let it idle for a minute, then turn it off and inspect the drain plug and case area for any signs of leaking oil.

Model-Specific Call-Outs for 2025 GAS GAS MC 65

  • The drain plug is located directly behind the shifter — using a shallow 13mm socket avoids having to remove the shifter, saving time and effort. This placement is unique to the 65cc models, so be sure your tool fits the tight space.
  • Oil Capacity: The GAS GAS MC 65 (as well as KTM and Husqvarna 65 models of the same platform) have a capacity of 500ml of oil for each change. Never overfill, as this can cause pressure issues and leaks.
  • O-Ring Maintenance: GAS GAS 65 models use an O-ring on the drain bolt, which should be inspected each time you change the oil and replaced regularly to prevent leaks and potential engine damage.
  • Recommended Oil Viscosity: 15W50 is the required weight; choosing another viscosity may reduce performance or protection.
  • No Oil Filter to Replace: The MC 65 uses a screen rather than a disposable oil filter. Routine removal and cleaning of the screen (if contaminated) is recommended but not required at every oil change for most casual riders.
  • Disposal: Always dispose of used oil properly at designated recycling locations.

Pro Tips

  • Warm up the engine slightly before draining to help the oil flow out more thoroughly.
  • Have all your supplies ready before you start to avoid unnecessary trips or delays during the process.
  • If you’re doing other maintenance, oil changes are a good time to inspect the shifter and left side of the bike for other issues, as access is already open.

Changing oil on your 2025 GAS GAS MC 65 is quick and easy with the right tools and preparation. For all parts, oils, and tools, trust MotoSport.com for everything you need to keep your youth MX bike in racing condition.

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Shop Tools for a 2025 GAS GAS MC 65 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2025 GAS GAS MC 65 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.