How to Change the Oil in a 2018 GAS GAS EC300: MotoSport.com Guide

Shop parts for a 2018 GAS GAS EC300 Dirt Bike.

If you own a 2018 GAS GAS EC300, regular oil changes are key to maintaining engine longevity and performance. Use this comprehensive guide from MotoSport.com to tackle the job yourself, including model-specific notes and pro tips for a safe and effective oil change.

Tools & Materials Needed

  • 6mm Allen socket or hex key (for drain and filler plugs)
  • Oil catch pan
  • Funnel (with a small tip for the fill hole)
  • Rags or shop towels
  • Replacement oil (5W40, specifically 900cc for the 2018 EC300)
  • Replacement drain plug gasket
  • Torque wrench (ensure 20 Nm for drain bolt)
  • Gloves (optional, keeps your hands clean)
  • Basic socket set (in case skid plate removal is required)

Preparation

  • Work on a cool and stable bike, preferably on a stand.
  • Let the engine idle for five minutes to warm the oil – this helps it drain out more completely

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  • Gather all parts and tools before starting. Some models require removal of the skid plate for better access to the drain plug

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Step-by-Step: Changing the Oil in a 2018 GAS GAS EC300

  1. Access the Drain Plug
    • Locate the oil drain plug—it’s usually at the bottom of the transmission case.
    • If you have a skid plate fitted, you may need to remove it for full access

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  2. Drain the Old Oil
    • Position your oil catch pan under the drain plug.
    • Use the 6mm Allen tool to loosen and remove the drain plug. Be careful—oil will drain quickly and may be hot.
    • Let all the oil drain out. Tilt the bike gently from side to side to help expel residual oil.
  3. Inspect and Replace the Drain Plug Gasket
    • Inspect the crush washer/gasket on the drain bolt. Replace it with a new one to ensure a leak-free seal

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    • Wipe down the plug and the surrounding area.
  4. Reinstall the Drain Plug
    • Screw the drain plug back in by hand, then torque to 20 Nm per the factory spec

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  5. Refill with Fresh Oil
    • Locate the oil fill plug (on the right side of the engine). The fill hole on this model is small–use a narrow funnel for accuracy

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    • Pour in exactly 900cc of 5W40 transmission oil. Overfilling or underfilling can cause clutch and transmission issues

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    • Replace the fill plug, ideally with a new gasket. Tighten to spec—hand tight plus a gentle snug is usually enough for the filler cap.
  6. Check for Leaks & Oil Level
    • Start the bike and allow it to idle for a minute. Inspect the drain and fill areas for any leaks.
    • Shut off the bike and let it rest for a minute. Use the sight glass or dipstick (if equipped) to ensure oil is at the proper level.
    • If needed, add a small amount oil to top off (never exceed max fill line).
  7. Reinstall Skid Plate
    • If you removed the skid plate, reinstall it and make sure all bolts are secure.
    • Dispose of old oil in accordance with local regulations.

Specific Model Call-Outs: 2018 GAS GAS EC300

  • Oil Fill Hole: On 2018 EC300, the fill hole is very small; a skinny funnel is required for a mess-free fill

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  • Oil Capacity: Do not exceed 900cc (per manufacturer). Overfilling can reduce clutch performance

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  • Drain Plug Access: Skid plate removal may be required for easy access

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  • Drain Plug Torque: 20 Nm. Always use a fresh washer/gasket to avoid leaks

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  • Oil Type: GAS GAS recommends 5W40 transmission oil. Use a high-quality brand that meets or exceeds manufacturer specification

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  • Change Interval: GAS GAS emphasizes regular oil changes due to the small oil quantity and high stress in two-stroke gearboxes

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Pro Tips for a Clean, Hassle-Free Oil Change

  • Warm up the bike but let it cool slightly before draining for safety.
  • Wipe surfaces clean to prevent dirt from entering open engine ports.
  • Keep spares: extra crush washers save time and avoid leaks.
  • Log your oil change date and hours for regular maintenance tracking.
  • Always dispose of used oil responsibly—most auto shops or recycling centers accept motor oil.

Conclusion

With the right tools and knowledge, changing the oil on your 2018 GAS GAS EC300 is easy and ensures top performance on the trail or track. For genuine parts, premium oil, and more model-specific guides, visit MotoSport.com — your trusted powersports authority.

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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.