How to Change the Oil in a 2004 Suzuki DRZ400SM

Shop parts for a 2004 Suzuki DRZ400S Dirt Bike.

Keeping your 2004 Suzuki DRZ400SM's oil fresh is key to top performance and long engine life. Follow this robust, step-by-step guide developed exclusively for MotoSport.com to ensure you do the job right, every time. This method covers both regular oil and oil filter changes, with specific notes for the 2004 DRZ400SM.

Tools & Parts Needed

  • Ratchet (3/8– drive recommended for best control)
  • Sockets: 8mm, 12mm, 17mm
  • Oil Drain Pan
  • New Oil Filter (OEM or quality aftermarket compatible with 2004 DRZ400SM)
  • 10W-40 Motorcycle Oil (2 quarts, high-quality recommended for Japanese motorcycles)
  • Torque Wrench (for peace of mind and proper assembly)
  • Funnel (to avoid spills during filling)
  • Gloves and Rags

Model-Specific Notes (2004 DRZ400SM)

  • The S, SM, and E models share the same engine architecture, so the process is identical across these trims.
    The SM features 17– supermoto wheels; be careful when placing your bike on a stand for maximal stability during maintenance.
  • Oil capacity with filter change: 1.8 liters (about 1.9 US quarts). When only changing oil (no filter), use 1.7 liters. DO NOT overfill.
    Consult your owner's manual for final confirmation to accommodate any changes from prior maintenance.
  • Be sure to replace the crush washer under each drain bolt if it shows wear or damage.
  • Inspect both the engine and the frame oil screens if you’re due for a full service. The frame houses a secondary filter screen in the oil circuit, which is occasionally overlooked.
    This is essential after a high-mileage interval or if you suspect engine debris.

Step-by-Step Oil Change Procedure

  1. Warm Up the Engine
    • Start the motor and let it idle for 2–3 minutes. Warm oil drains easier and carries away more contaminant particles.
    • Shut off the engine and ensure the bike is stable on a stand.
  2. Remove Oil Filler Cap
    • Locate the oil filler cap/dipstick on the top of the frame. Remove it to allow the system to vent — this accelerates draining.
  3. Drain Oil from the Crankcase
    • Place your drain pan under the bottom of the engine.
    • Using a 17mm socket, remove the main engine drain bolt and washer. Let the oil flow out completely.
    • Inspect the drain bolt and its washer. Replace the washer if it's deformed or damaged.
  4. Drain Oil from the Frame
    • Position the drain pan under the frame's lower tube.
    • Using a 12mm socket, remove the frame drain bolt and washer. Wait until oil stops dripping; this clears the oil held in the bike's oil labyrinth.
    • Inspect and replace the washer if needed.
  5. Clean or Replace Oil Filter
    • With an 8mm socket, remove the oil filter cover.
    • Pull out the old oil filter. Take note of the filter's orientation (the hole faces outward on OEM filters).
    • Wipe out the filter cavity and check the cover gasket for cracks or flattening. Replace the gasket if needed.
    • Install the new filter. Reinstall the cover, tighten the bolts evenly, and ensure a snug (not overtightened) fit.
  6. Reinstall and Torque the Drain Bolts
    • Put the crankcase and frame drain bolts back on with new or good washers.
    • Torque the crankcase (17mm) drain bolt to 15 foot-pounds for a proper seal without over-tightening.
    • The frame bolt (12mm) should be snug but not overtightened; check your service manual for a specific value.
  7. Add New Oil
    • Using a clean funnel, slowly add 1.8 liters (1.9 quarts) of 10W-40 motorcycle oil for a filter change. For oil-only, use 1.7 liters (1.8 quarts).
  8. Check Oil Level and Run Engine
    • Reinstall the filler cap/dipstick.
    • Start the engine and let it idle for about five minutes. Check for leaks at all drain and filter points.
    • Stop the engine, let it settle a few minutes, and check the oil level with the dipstick. Top up if necessary — do not exceed the full mark.
  9. Final Steps
    • Reattach any skid plates or guards if removed.
    • Dispose of used oil and filters responsibly at your local recycling center.
    • Clean your work area and enjoy the confidence of fresh oil in your DRZ400SM.

Expert Tips for the 2004 DRZ400SM

  • Always use motorcycle-specific oil — avoid auto oils, as their friction modifiers can cause clutch slippage.
  • Double check that your washers are not re-used excessively as this is a common source of leaks.
  • If you ride mostly off-road or in harsh conditions, shorten your oil change interval for optimal engine health.
  • Keep an extra quart of oil and a filter in your garage for quick changes — the DRZ400's robust engine appreciates regular fresh oil, especially after hard use.

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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.