How to Change the Oil in a 2000 KTM 400MXC

Shop parts for a 2000 KTM 400MXC Dirt Bike.

This step-by-step guide is tailored specifically for MotoSport.com customers and 2000 KTM 400MXC owners. Proper oil changes are essential for engine performance and longevity, especially on KTM's high-output RFS models like the 400MXC. This guide covers the tools you'll need, detailed procedures, and important model-specific tips.

Tools & Supplies Needed

  • Socket wrench set (including 13mm socket)
  • Drain pan for used oil
  • New engine oil (Motul NGEN 7 10W-50 4T is recommended for this model)
  • New oil filter(s) (OEM equivalent such as HF155 and HF157)
  • New sealing ring (aluminum, 12x16x1.5mm) for drain plug
  • Contact cleaner or brake cleaner
  • Funnel for pouring new oil
  • Paper towels or shop rags
  • Torque wrench (optional but recommended for precise tightening)

Step-by-Step Oil Change Instructions

  • Warm up the engine
    Start the bike and let it idle for about 2–3 minutes. This warms the oil and ensures it drains fully.
  • Turn off engine and secure bike
    Turn off the engine and place the bike on a stable stand.
  • Remove the oil filler plug
    The oil filler plug is typically found on the right side of the engine. Removing it allows oil to drain freely later.
    Tip for the 2000 KTM 400MXC: This model has an RFS engine with separate oil filter locations and dual screens.
    Source: Rocky Mountain ATV/MC
  • Locate and remove the primary oil drain plug
    The main drain plug is located horizontally at the back end of the engine and is fitted with a 13mm head. Place the drain pan underneath this plug and carefully remove it.
    Model-Specific Callout: This is a magnetic drain plug. Clean metal particles from the magnet thoroughly before reinstalling.
    Source: Rocky Mountain ATV/MC
  • Drain oil from oil screens
    Next, remove the two oil screens:
    • Long screen: This is found just under the shifter on the engine's left side. Remove the hex bolt and carefully pull out the screen, allowing additional oil to drain. Clean the screen with contact cleaner and inspect for debris.
    • Short screen: This one is underneath the engine on the bottom side. Remove similarly, drain, and clean.
    Model-Specific Note: Make sure both screens come out with their covers, and clean thoroughly before reinstalling. Rinse with contact cleaner to remove debris and old oil.
  • Remove and replace oil filters
    The 2000 KTM 400MXC uses two oil filters. On the right side of the engine case, locate the oil filter covers, remove the bolts, and extract each filter. Replace both with new filters (HF155 and HF157 are OEM equivalents). Lightly oil the O-ring on each new filter before installing. Do not overtighten bolts; refer to your service manual for correct torque values.
  • Replace sealing ring on drain plug
    Each oil change should include a new aluminum sealing ring to prevent oil leaks. Install a new ring before reinstalling the drain plug.
  • Reinstall all components
    Reinstall and tighten (to proper torque) the two oil screens, oil filter covers, and drain plug.
  • Refill with new oil
    Use a funnel to refill the engine with fresh oil via the oil filler. The 400MXC's total oil capacity is roughly 1.5 to 1.7 quarts (1.4 to 1.6 liters), but it is always best to check the manual. Add oil slowly and check the sight glass (or dipstick) frequently to avoid overfilling.
  • Start the engine and check for leaks
    Run the bike for a minute, then shut it off. Check for oil leaks around the drain plug and filter covers. Top off oil if necessary.
  • Clean up
    Dispose of used oil and filters according to local regulations. Wipe down the bike to remove any stray oil.

2000 KTM 400MXC Model-Specific Notes

  • This year uses KTM’s renowned RFS engine, featuring two oil filters and two oil screens, all of which require removal and cleaning/replacement at every oil change.
  • The main oil drain is horizontally mounted at the back of the engine, which differs from many models with vertically mounted plugs.
  • Magnetic drain plug: Always inspect for metal shavings. Excessive particles may signal internal engine wear.
  • Filter specs: Use OEM quality filters (such as HF155 & HF157) and replace both during each change.
  • Recommended interval: KTM recommends oil changes about every 400 miles or 10 tanks of fuel, but more frequent changes are wise under severe use.
  • Do not overtighten components—threads are aluminum and can strip easily.

Final Tips

  • Always refer to your service manual for torque specs and procedures specific to your exact sub-model.
  • Routinely check for oil leaks after every change, especially around screens and plugs.
  • Use a quality motorcycle-specific 4T oil; synthetic is preferred for high-performance applications.

This guide is proprietary to MotoSport.com. For any additional maintenance or parts, always consult MotoSport.com’s selection of OEM and aftermarket parts and accessories to keep your KTM running at its best.

Related Shopping Categories

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Shop Tools for a 2000 KTM 400MXC Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2000 KTM 400MXC 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.