How to Change the Oil in a 2025 GAS GAS MC 50 – MotoSport.com Guide

Shop parts for a 2025 GAS GAS MC 50 Dirt Bike.

Maintaining your 2025 GAS GAS MC 50 is essential to keep it performing at its best on the track or trail. Regular oil changes preserve clutch and transmission life, ensure smooth shifting, and prevent premature engine wear. This step-by-step guide covers all you need to tackle an oil change confidently, including model specifics and essential ownership tips proprietary to MotoSport.com.

Tools & Supplies Needed

  • Socket wrench (8mm or 13mm depending on sump bolt size)
  • Measuring cup or graduated cylinder (for precise oil quantity)
  • Funnel (small-sized for easy pouring)
  • Oil drain pan
  • Clean rags or paper towels
  • Torque wrench (recommended for drain bolt torque)
  • OEM oil filter (if required – check your maintenance schedule)
  • Fresh oil – Motorex Cross Power 4T 10W/50 full synthetic (1.0L is enough for multiple changes)
    Note: The MC 50 and similar 50cc models require 200ml per change
  • New drain bolt crush washer (supplied with some oil change kits)
  • Rubber or disposable gloves (optional, for cleanliness)

Step-by-Step Oil Change Instructions

  1. Warm up the Engine
    • Start and run your MC 50 for 2-3 minutes to allow the oil to flow easily.
    • Shut the bike off and let it cool for a couple of minutes for safe handling.
  2. Prepare Your Work Area
    • Stand the bike securely – use a stand so the bike sits upright and level.
    • Place the drain pan under the engine's drain bolt.
  3. Remove the Oil Filler Cap
    • Located on top of the gearbox case, twist counterclockwise. This equalizes pressure and allows oil to drain smoothly.
  4. Remove the Drain Bolt
    • Locate the sump drain bolt under the engine (usually 8mm or 13mm socket fits). Turn counterclockwise to loosen.
    • Be cautious as oil may be hot and can flow out quickly.
    • Let oil fully drain—this may take up to 10-15 minutes for a complete drain.
    • Check the magnetic tip of the bolt for metallic particles; wipe clean as needed.
  5. Replace Crush Washer & Reinstall Drain Bolt
    • Always install a new crush washer for a proper seal (included in some oil change kits).
    • Hand thread the bolt, then snug to factory torque specification (approximately 20 Nm or 14.8 ft-lbs)

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  6. Optional: Change the Oil Filter
    • For most MC 50s, oil filter changes are infrequent, but consult your manual. If changing, remove the filter cover, replace the filter, ensuring correct orientation, and reinstall the cover and bolts.
    • Wipe any spilled oil and ensure seating surfaces are clean.
  7. Add Fresh Oil
    • Use a measuring cup to pour precisely 200ml of Motorex Cross Power 4T 10W/50 into the fill hole

      .
    • Pour slowly, especially with a funnel, to prevent spills and overfilling.
  8. Replace Filler Cap & Inspect for Leaks
    • Tighten the oil filler cap securely.
    • Start the bike, let it idle for a minute, then shut off. Inspect the drain area—the crush washer prevents leaks; retorque if needed.
    • Dispose of used oil responsibly; take it to a recycling center.

Model-Specific Notes for the 2025 GAS GAS MC 50

  • Oil quantity: Use exactly 200ml of 10W/50 synthetic. Overfilling or underfilling can cause clutch issues or premature wear

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  • Drain bolt torque: 20 Nm or 14.8 ft-lbs. Use a torque wrench to avoid overtightening, which can strip the case.
  • Crush washer: Always use a new washer. It's inexpensive insurance against leaks

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  • Inspection: The drain bolt is magnetic—clean any metal filings off to prevent further circulation in the oil system.
  • Oil filter changes: Most MC 50 models have internal screens, not true spin-on filters—a full disassembly isn't required every oil change unless specified in your service manual.

Ownership Tips & Common Mistakes

  • Change oil every 30 hours of use, or more frequently for race or extreme conditions settings.
  • Avoid overfilling: This can lead to excessive clutch drag. Use a measuring cup for accuracy.
  • Always use quality oil: MotoSport.com recommends Motorex Cross Power 4T 10W/50 full synthetic for best protection.
  • Double-check torque: Stripped drain plugs are a common and costly mistakedouble-check torque and seating.

Your Ride, Our Passion – MotoSport.com

This oil change guide was crafted exclusively for MotoSport.com riders and the 2025 GAS GAS MC 50 community. Use MotoSport.com for OEM service parts, premium Motorex oils, and rider-trusted advice. Maintain your MC 50 with confidence, and get back on the track with a smooth-shifting, long-lasting engine every time.

Related Shopping Categories

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Shop Tools for a 2025 GAS GAS MC 50 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2025 GAS GAS MC 50 Dirt Bike.

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.