How to Change the Oil in a 2023 GAS GAS MC 65 — The MotoSport.com Guide

Shop parts for a 2023 GAS GAS MC 65 Dirt Bike.

Changing the oil in your 2023 GAS GAS MC 65 is crucial for keeping your mini motocrosser running strong. This guide will provide step-by-step instructions, detail all required tools, and offer tips specifically relevant to this bike. While oil changes are simple, they can make a big difference in the reliability and lifespan of your engine. Let’s get started.

Tools & Supplies Needed

  • 13mm shallow socket (3/8" drive, with 3/8" ratchet and 3/8" extension)
  • Oil catch pan
  • Replacement oil (500ml of 15W-50 motorcycle oil—GasGas recommends Motorex, but high-quality alternatives like AMSOIL are fine)
  • Measuring container (to ensure an accurate oil refill)
  • Clean funnel
  • Clean rag
  • O-rings (replace if damaged or as needed)
  • Gloves and mild degreaser (optional for cleanup)

Important Notes for the 2023 GAS GAS MC 65

  • The oil drain bolt is located behind the shifter on the left side of the engine. Using a shallow 13mm socket fits better than a deep-well, so you do not have to remove the shifter to access the bolt. This saves time and hassle during the oil change process

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  • Oil Capacity: 500ml (or .53 quarts). Overfilling or underfilling can harm the clutch and gearbox.
  • Model Interchangeability: The 2023 GAS GAS MC 65 shares its engine and oil change procedure with the KTM 65 SX and Husqvarna TC 65. Instructions and capacities are the same.

Step-by-Step Instructions

  1. Warm Up the Engine
    • Start and idle the engine for a few minutes to let the oil warm up and thin. This helps it drain completely.

  2. Prepare the Bike
    • Place the bike upright on a stable stand. Ensure the stand gives access to the drain bolt. Some stands may block the bolt, so check fitment first.

    • Position your oil catch pan underneath the drain bolt behind the shifter.
  3. Remove the Drain Bolt
    • Use the 13mm shallow socket with extension to remove the drain bolt.
    • Allow the oil to completely drain into the catch pan. Be patient and tip the bike gently side-to-side if needed to get the last drops out.

  4. Inspect and Clean the Drain Bolt
    • Wipe the drain bolt clean and inspect the O-ring. Replace if it looks worn or damaged to ensure a good seal.

  5. Reinstall the Drain Bolt
    • Thread the bolt in by hand first to avoid cross-threading.
    • Torque to manufacturer spec (if available) or until snug. Do not overtighten—stripped cases are expensive.
  6. Add New Oil
    • Use a clean funnel to add 500ml (half a liter) of 15W-50 motorcycle oil.

    • Measure precisely. Too much or too little oil on this small engine can affect clutch operation and engine protection.
  7. Check Oil Level
    • Start the bike, idle for 20–30 seconds, then shut it off.
    • With the bike upright, remove the filler plug and check oil level according to the sight glass or dipstick (as equipped).
    • Top off if needed, but never exceed the recommended amount.
  8. Clean Up
    • Wipe away any oil drips, recheck for leaks at the drain bolt, and ensure the filler plug is tight.
    • Dispose of old oil responsibly—never pour down drains or onto the ground.

Pro Tips and Model-Specific Call-Outs

  • Unique to GAS GAS MC 65: The drain bolt is set behind the shifter. A shallow 13mm socket saves the headache of removing the shift lever.

  • When in Doubt: Always double-check the O-ring. Even a small nick can cause leaks and damage your engine.

  • Oil Preference: Although Motorex is the official recommendation, quality synthetic motorcycle gear oil like AMSOIL Dominator is a popular choice and works well.

  • Year-Specific Details: No significant oil change differences are documented for 2023 vs. previous years on the MC 65. Procedure and capacity remain the same for all recent models sharing this engine/chassis platform.

Final Checks

  • Ride easy for a short distance, then check for leaks under and around the drain bolt and oil filler cap.
  • Track your ride hours and plan to change oil every 5–10 hours for max protection—more frequently for hard racing. Fresh oil is cheap prevention.

Keep your 2023 GAS GAS MC 65 running hard and shifting smooth by following these steps every oil change. For all your supplies and OEM parts, trust MotoSport.com for quality gear and quick shipping.

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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.