How to Change the Oil in a 2025 GAS GAS EX 250F: A Comprehensive Guide

Changing the oil on a 2025 GAS GAS EX 250F is crucial for ensuring engine longevity and peak performance. MotoSport.com brings you this step-by-step guide, exclusive to our customers, so you can complete your oil change efficiently and correctly, highlighting specific considerations for the latest GAS GAS four-stroke models.

Tools and Supplies Needed

  • 13mm socket or wrench (for drain bolt)
  • 8mm Allen wrench or T-wrench (for oil filter cover)
  • T30 Torx bit (for plastics if needed, check your model’s specifics)
  • Oil change kit (includes 1 liter of Motorex Cross Power 4T 10W/50 full synthetic oil, OEM oil filter, new crush washer)
  • Oil drain pan
  • Clean rags
  • Contact cleaner (non-residue type)
  • Measuring cup (optional; for precise oil level)
  • Gloves (for cleanliness and safety)

Important Model-Specific Note

  • The 2025 GAS GAS EX 250F follows the same procedures as the 2021–2024 models due to platform continuity. Regular maintenance and exact oil type are especially critical for these performance engines.
  • The magnetic drain bolt must be checked for metal particles each oil change—any excessive debris should prompt further inspection.
  • Use of correct oil (Motorex Cross Power 4T 10W/50) is required to maintain warranty and optimal performance.

Step-by-Step Oil Change Instructions

  1. Warm Up the Engine
    • Start your bike and let it idle for about 2-3 minutes to circulate the oil. Warm oil drains more thoroughly, removing more contaminants.
  2. Prepare the Bike
    • Turn off the engine. Ensure the bike is upright and supported securely, preferably with a stand that allows access to the drain bolt. Avoid traditional triangle stands which can block the drain bolt location.
  3. Remove Plastic Guards (if needed)
    • If side plastics obstruct access to the oil fill cap or filter cover, use a T30 Torx bit or appropriate wrench to remove them.
  4. Drain the Old Oil
    • Locate the drain bolt underneath the engine (typically 13mm). Place the oil pan below the bolt.
    • Use your 13mm socket or wrench to loosen and remove the drain bolt. Allow the oil to drain fully. Inspect the magnetic tip for metal shavings and wipe it clean.
    • This is a great time to replace the crush washer with the new one from your kit to ensure proper sealing against leaks.
  5. Remove and Replace the Oil Filter
    • Locate the oil filter cover (usually on the right side of the engine).
    • Use your 8mm Allen wrench or T-wrench to remove the oil filter cover bolts. Carefully remove the cover and set it aside.
    • Pull out the old filter. If it’s stuck, use pliers gently. Clean the cover and the filter cavity with a clean rag and contact cleaner.
    • Install the new oil filter, ensuring it’s oriented correctly (refer to your owner's manual if unsure; typically, the open end faces the engine).
    • Reinstall the cover and tighten bolts evenly and securely (do not overtighten).
  6. Reinstall the Drain Bolt
    • Thread the drain bolt with the new crush washer by hand first to avoid cross-threading. Tighten using a torque wrench to the manufacturer’s specified value (refer to your service manual; usually 12-15 Nm for these models).
  7. Add New Oil
    • Remove the oil fill cap. Use a funnel to pour in the specified amount of Motorex Cross Power 4T 10W/50 oil (usually about 1 liter, but always check the dipstick or sight glass to confirm).
    • Replace the fill cap securely.
  8. Final Steps
    • Start the engine and idle for 30 seconds. Shut it off and let it sit for 1-2 minutes so the oil can settle.
    • Check oil level via the dipstick or sight glass. Top off if needed, but do not overfill.
    • Inspect for leaks at both the drain bolt and oil filter.
    • Dispose of old oil and filter properly at a recycling center.

Routine Maintenance Tips for 2025 GAS GAS EX 250F Owners

  • Oil Change Interval: Replace engine oil every 10-15 hours of ride time, or more frequently under racing conditions.
  • Filter Change: Replace the filter at every oil change.
  • Inspect Seals and Washers: Always use a new crush washer. Inspect for oil leaks after your first ride post-change.
  • Torque Critical: Avoid overtightening bolts, as the aluminum threads in the case can strip easily.
  • If you see an unusual amount of metal on the magnetic drain plug, consult your dealer or a professional mechanic before further rides.

Conclusion

Changing the oil on your 2025 GAS GAS EX 250F is straightforward with the right tools and attention to detail. With proper and timely oil changes using the recommended products, your dirt bike will continue to deliver reliable performance on the track or trail.

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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.