How to Change the Oil in a 2014 GAS GAS EC300F – MotoSport.com Guide

Shop parts for a 2014 GAS GAS EC300F Dirt Bike.

Keeping your 2014 GAS GAS EC300F running smoothly means regular oil changes. Here’s a step-by-step, hands-on blog tailored for this distinct enduro dirt bike, highlighting the tools you’ll need, the right process, and key callouts specific to this make and model.

Tools and Supplies Needed

  • Allen wrench set (6mm recommended)
  • Socket wrench set
  • Oil drain pan
  • Funnel (preferably with a flexible spout)
  • 1 liter premium 4T 10W/50 full synthetic oil (capacity is 900ml; always check your manual)
  • OEM oil filter (replace if necessary)
  • Replacement crush washer (good practice to change every time)
  • Clean shop rags
  • Gloves (optional but recommended)
  • Skid plate removal tool (if equipped)
  • Oil drain tool or plug washer tool (optional but can reduce mess)

Step-by-Step Oil Change Process

  1. Warm Up the Engine
    Start the bike and let it idle for 3-5 minutes. Warm oil thins out, allowing it to drain fully and carry more contaminants out. Shut the engine off and let it cool slightly so you don’t burn yourself.
  2. Access the Drain Plug
    Place the bike on a stable surface, preferably a stand. Remove the skid plate if equipped, which usually involves removing a couple of Allen bolts. The drain plug is located on the bottom of the engine and should be accessible through or after removing the skid plate.
  3. Drain the Old Oil
    Position your oil drain pan below the drain plug. Using a 6mm Allen wrench, loosen and remove the drain plug. Allow all the oil to drain out. Tip: Lay the bike slightly over to the side (gently leaning against a wall works) to ensure maximum drainage, especially since the EC300F’s fill and drain orientation isn’t ideal and oil can remain trapped if left upright.
  4. Remove and Inspect the Oil Filter
    Locate the oil filter cover, remove the necessary bolts and the filter. Inspect for debris and replace with a new OEM oil filter if necessary. Inspect the magnetic drain plug for metal shavings (some fine material is normal; large chunks could indicate internal issues).
  5. Replace the Crush Washer
    Every oil change should include a new crush washer on the drain bolt to prevent leaks. Clean the bolt and threads before reinstalling.
  6. Reinstall the Drain Plug and Oil Filter
    Refit the oil filter (if changed) and torque it to spec as per the owner’s manual. Secure the drain plug with the new crush washer and tighten to the manufacturer’s recommended torque setting.
  7. Add New Oil
    Specific callout for GAS GAS EC300F owners: The oil fill hole is quite small and inconveniently placed. To avoid spills, use a funnel with a long or flexible spout. Add 900ml of oil (be precise—don’t overfill). If possible, check for proper level via the sight glass or dipstick.
    • If you have difficulty, slightly laying the bike over helps oil enter the fill hole easily.
    • A dedicated aluminum drain tool can make draining less messy for this chassis/engine layout.
  8. Check for Leaks
    Wipe all areas and inspect for leaks around the drain bolt and oil filter. Replace and torque those bolts, and reinstall the skid plate if removed.
  9. Start and Re-Check
    Start the engine, let it idle for about a minute, and check again for leaks. Let the bike stand for a few minutes then ensure the oil level is still correct, topping off if necessary.

Model Year-Specific Tips and Callouts

  • The EC300F’s fill hole is short and angled—using a flexible, tight-fitting funnel can save a lot of mess and frustration.
  • Capacity is 900ml, not 1 liter. Overfilling can cause problems with clutch performance and premature seal wear.
  • Drain plugs can easily strip if overtightened; always use the correct Allen size gently, and torque to spec.
  • Always check for debris on the magnetic drain plug at each change—minor buildup is normal, but large flakes mean immediate service is needed.
  • If you’ve fitted an aftermarket skid plate, ensure alignment of its drain hole with the drain bolt for easier future changes.
  • Only use high-quality full synthetic 10W/50 oil, as cheap oils can lead to shifting problems and clutch wear on this high-performance four-stroke.

Final Thoughts

With regular oil changes, your 2014 GAS GAS EC300F will deliver consistent, high-revving off-road performance. Careful attention to the tricky fill and drain design will keep tasks hassle-free and your bike running at its best. For premium oils, OEM filters, and all the tools you need, MotoSport.com has you covered—ride smart and maintain often.

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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.