How to Change the Oil on a 2022 GAS GAS EX 300

Shop parts for a 2022 GAS GAS EX 300 Dirt Bike.

Keeping up on regular oil changes is crucial for the long-term reliability and performance of your 2022 GAS GAS EX 300. This guide, proprietary to MotoSport.com, walks you through every step of the process and calls out special considerations for this make and model. Regular maintenance not only extends engine life but also maximizes the enjoyment you’ll get from your bike on every ride.

Tools & Supplies Needed

  • 6mm Allen socket or wrench (for drain and fill plugs)
  • Oil drain pan
  • Funnel
  • Fresh transmission oil – Use oil formulated for two-stroke transmissions as recommended in your owner's manual
  • Rags or shop towels
  • Torque wrench (optional, but recommended)
  • Rubber gloves (optional, for cleanliness)
  • Oil Drain Tool (like the NICECNC Oil Drain Tool Kit can make this process much less messy and easier, especially if you wish to avoid removing the skid plate)

How To Change the Oil

  1. Warm Up Your Engine
    • Start your bike and let it idle for a couple of minutes. This brings the oil up to temperature, which helps to suspend any contaminants in the oil and ensures a more thorough drain.
  2. Place Your Oil Pan
    • Position the oil drain pan under the oil drain bolt. On the 2022 GAS GAS EX 300, the drain plug is on the bottom of the engine case and is accessible, even with most stock skid plates, thanks to a pre-cut hole . If you have an aftermarket skid plate, make sure the drain hole aligns; if not, remove the skid plate or use a long oil drain tool .
  3. Remove the Drain Plug
    • Use a 6mm Allen wrench or socket to loosen and remove the plug. Be cautious—used oil can be hot.
    • Let the oil drain completely. Tilting the bike slightly from side to side carefully can help remove trapped oil .
  4. Inspect and Clean the Plug
    • Examine the drain plug for metal particles or debris. The plug may have a magnetic tip to catch these.
    • Clean thoroughly with a shop towel.
    • If your plug has a small screen or mesh, clean it as well .
  5. Replace the Plug
    • After the oil has drained completely, re-install the drain plug, tightening it securely. Use a torque wrench if possible to the specification in your owner’s manual (typically around 10 Nm, but verify for your specific bike).
    • If you use a drain tool with an O-ring, check its condition before reinstalling; replace if worn for leak prevention .
  6. Fill with New Oil
    • Remove the oil fill plug (located on the right side of the engine case near the kickstart area) using the 6mm Allen wrench .
    • Using a funnel, add the recommended amount and type of oil. For the 2022 GAS GAS EX 300 transmission, fill with 900 ml of oil (double check your owner’s manual for any updated spec) .
    • Add oil in two passes (for example, pour 500ml, wait, then the remaining 400ml) to reduce overfills .
    • Do not overfill – overfilling can lead to poor shifting and possible leaks.
  7. Replace the Fill Plug
    • Wipe away any spilled oil from around the fill opening.
    • Install the fill plug and tighten securely.
  8. Check for Leaks
    • Start the engine and let it idle for a minute, then turn it off and inspect around both the drain and fill plugs for leaks.
    • Wipe off any drips and recheck as necessary.
  9. Dispose of Used Oil Properly
    • Used oil should always be disposed of at an authorized recycling or collection facility. Never pour used oil down drains or onto soil.

Special Call-Outs for the 2022 GAS GAS EX 300

  • This bike is a two-stroke, so you’re changing transmission oil, not engine oil. There is no replaceable oil filter on this transmission—just a drain and refill process .
  • Skid Plate Access: If you use an aftermarket skid plate that does not align with the factory hole for the drain plug, consider an oil drain tool with a long hose to avoid removing the plate . This makes future maintenance much cleaner by directing oil away from frames and plates.
  • Oil Capacity is 900 ml–do not exceed this amount .
  • Inspect Drain Plug Screen: The plug may have a fine mesh or screen to trap large particles—clean this at every change .
  • No Oil Level Sight Glass: This model does not have an external sight glass. Rely on measuring and correct filling.
  • No Oil Filter Maintenance: Unlike most four-strokes, you do not need to change an oil filter.

Troubleshooting & Pro Tips

  • If you lose track of how much oil you’ve poured in, do not rely on dipsticks (some models do not use them). Drain oil and measure during refill.
  • Changing oil more often is good insurance if you ride in harsh environments or conditions.
  • Keep spare crush washers on hand for the drain plug; always replace if there are signs of flattening or damage to prevent leaks.

That’s it – you’re ready to ride. Regular oil changes on your 2022 GAS GAS EX 300 will repay you with reliable shifting, a happy transmission, and years of performance. For additional parts, oils, or tools, visit MotoSport.com—the source for everything dirt bike.

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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.