How to Change the Oil in a 2013 GasGas EC300

Shop Parts for a 2013 GAS GAS EC300 Dirt Bike.

Changing the oil in your 2013 GasGas EC300 is an essential maintenance task that helps keep your dirt bike running smoothly and prolongs the life of your engine and transmission. This proprietary MotoSport.com guide breaks down the process with step-by-step instructions, a list of required tools, and specific call-outs for your bike. Always refer to your owner’s manual for any model-specific nuances.

Tools and Supplies Needed

  • Socket set (metric)
  • 6mm Allen wrench (socket type recommended)
  • Oil funnel
  • Oil drain pan
  • Clean shop rags
  • Fresh motorcycle-specific transmission oil (recommended: 10W-40, 900ml capacity for your model)
  • Optional: torque wrench
  • Optional: gloves and safety glasses

Model-Specific Call-Outs

  • The 2013 GasGas EC300 is a two-stroke motorcycle, so you are only changing the transmission oil, not engine oil as in a four-stroke.
  • The oil capacity is 900ml—be precise with your measurement to avoid under- or over-filling.
  • The fill plug is located on the left side of the engine case and is notably small, which can make adding new oil a bit tricky without the right funnel.
  • You may need to remove a skid plate or accessory plate guard to access the drain bolt, depending on your bike’s configuration.
  • Always check for and clean the oil screen if your model is equipped with one—though not always present on the EC300, it’s a good habit to check during oil changes.
  • Leaning the bike over during filling can help achieve the correct oil level, as the bike must be upright for an accurate check.

Step-by-Step Oil Change Process

  1. Prepare the Bike
    • Run the engine for a few minutes to warm the oil, making it easier to drain. Then, shut off the engine.
    • Place the bike on a stand or level surface. Have your oil drain pan ready beneath the engine.
  2. Access the Drain Plug
    • If equipped, remove the skid plate or accessory plate guard. This usually requires undoing a few bolts with a socket or Allen wrench.
    • Locate the drain plug on the bottom of the engine case.
  3. Drain the Old Oil
    • Place the drain pan directly under the drain plug.
    • Using a 6mm Allen wrench (socket type is best), carefully remove the drain plug and allow the oil to drain completely.
    • Once the oil has stopped dripping, reinstall the drain plug and hand-tighten. If using a torque wrench, tighten to the manufacturer’s specification (consult your manual).
  4. Refill With Fresh Oil
    • Locate the oil filler plug on the left side of the engine case.
    • Remove the fill plug using the appropriate tool.
    • Insert a clean funnel into the fill hole. Due to the small size and awkward angle, you may need to lean the bike slightly to help the oil flow in without spilling.
    • Slowly pour in the recommended amount of fresh oil (900ml for your model). Take your time to avoid spills.
    • Replace the fill plug and tighten securely.
  5. Check the Oil Level
    • Start the engine and let it idle for a minute, then shut it off.
    • Ensure the bike is perfectly upright (not on a stand or leaning).
    • Remove the fill plug again—oil should be at the bottom of the threads. If not, add a small amount more until it reaches the correct level.
    • Replace the fill plug once satisfied.
  6. Clean Up
    • Wipe away any spilled oil from the engine and surrounding areas.
    • Reinstall the skid plate or accessory guard if removed.
    • Properly dispose of the used oil at a recycling center.

Additional Tips for the 2013 GasGas EC300

  • If your bike has an oil screen, now is a good time to remove and clean it before reinstalling.
  • Leaning the bike over during filling can make it easier to avoid spills due to the small, awkwardly placed fill hole.
  • Always use motorcycle-specific transmission oil–regular automotive oil is not suitable.
  • Check the owner’s manual for the recommended oil type and change intervals, and keep a log of your maintenance.
  • If you notice any metal particles or debris in the old oil, consider having your bike inspected by a professional.

Conclusion

Regular oil changes are vital for the longevity and performance of your 2013 GasGas EC300. While the process is straightforward, the unique placement of the fill plug and the 900ml oil capacity require a bit of patience and the right tools. By following this MotoSport.com guide, you’ll keep your EC300 running at its best for years to come.

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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.