How to Change the Oil in a 2008 Suzuki DRZ400SM

Shop parts for a 2008 Suzuki DRZ400SM Dirt Bike.

Regular oil changes are vital for keeping your 2008 Suzuki DRZ400SM running smoothly and ensuring long engine life. The DRZ400SM’s design means the oil change procedure is similar across all model years, but following the right process and using the correct tools and specifications for your bike is essential. Below you’ll find a comprehensive, proprietary MotoSport.com guide, featuring all the tools you’ll need, step-by-step instructions, and critical call-outs specific for your DRZ400SM.

Tools and Parts Needed

  • Ratchet wrench
  • 8mm socket
  • 12mm socket
  • 17mm socket
  • Torque wrench
  • Drain pan
  • Funnel
  • Shop towels or rags
  • Gloves and safety glasses
  • Engine oil (10W-40 motorcycle oil, 2 quarts recommended)
  • New oil filter
  • Replacement washers (for drain bolts, as needed)

Before You Start

  • Warm up the engine briefly—letting the bike idle for just a few minutes—so the oil drains out smoothly.
  • Ensure the bike is upright and secured, ideally on a stand.
  • Double-check you have all required parts and tools within reach.

Step-by-Step Oil Change Process

  1. Remove the Oil Filler Cap
    Locate and remove the oil filler cap/dipstick, which is situated on top of the frame. This allows proper venting and helps the oil drain completely.
    Tip: Set the cap in a clean location—do not lose the O-ring.
  2. Drain the Engine Oil – Crankcase Drain
    Place your drain pan beneath the crankcase. Using the 17mm socket, remove the crankcase drain bolt and its washer. Allow the oil to drain completely.
    Inspect the washer. Replace if damaged to avoid leaks when you reinstall the bolt.
    Reinstall the drain bolt and washer, torque to 15 ft-lbs.
    Specific to DRZ400SM: The drain positions and torque requirements are the same as other DRZ400 models, and no underbody plastics need to be removed.
  3. Drain the Frame Oil
    Move the drain pan under the lower frame area and use the 12mm socket to remove the second drain bolt and washer. Let the remaining oil drain out.
    This dual-drain setup is unique to Suzuki’s dry sump design—do not skip this step.
  4. Remove and Replace the Oil Filter
    The oil filter cover is typically held on with three 8mm bolts. Carefully remove the cover; expect some residual oil.
    Take out the old oil filter, wipe down the area with a clean rag, and fit the new filter according to orientation marks.
    Check for a small rubber O-ring on the filter cover—replace if worn or damaged.
  5. Install Drain Bolts
    Reinstall both the crankcase and frame drain bolts (with washers), and torque to the manufacturer’s specification (typically 15 ft-lbs).
    Over-tightening can strip threads; use a torque wrench for accuracy.
  6. Add New Oil
    Use a funnel to pour 1.8 liters (when changing both oil and filter) of 10W-40 motorcycle oil into the filler neck. If changing oil only (no new filter), use 1.7 liters.
    Do not exceed the recommended oil quantity—overfilling can harm engine performance.
  7. Check and Adjust the Oil Level
    Reinstall the oil filler cap/dipstick. Start the engine and let it idle for five minutes, turning it off afterward to let the oil settle.
    Remove the dipstick, wipe it clean, and check the level by reinserting it (per the owner’s manual instructions). If needed, add small amounts of oil and recheck.
    Inspect for leaks at all drain points. Tighten bolts further only if a leak appears.
  8. Final Inspection
    Clean up any spills. Double-check for leaks around drain plugs and filter cover.
    After a brief ride, re-check oil level and for any oil drips below the engine.

DRZ400SM-Specific Call-Outs

  • The DRZ400SM shares its engine and oil system with all DR-Z400 variants, so the same 8mm, 12mm, and 17mm sockets fit all critical fasteners.
  • You do not need to remove the skid plate for standard oil changes on this 2008 model year.
  • If your bike has aftermarket case guards or a non-stock oil filter cover, check for fastener differences.
  • The 2008 DRZ400SM utilizes a dry-sump system, so draining both the crankcase and frame is mandatory for a thorough oil change.
  • Suzuki recommends the first oil change at 600 miles, then every 3,500 miles afterward as regular intervals.
  • When replacing washers, use OEM parts for best fit—thinner generic washers can cause leaks.
  • Always verify proper torque with a torque wrench to avoid damaging the M12 and M17 drain bolt threads.

Hidden Filter/Screen Note

  • The DRZ400SM includes a frame filter screen at the oil inlet port. Inspect and clean this screen periodically during oil changes to catch particle buildup. This is accessible by removing the large cap at the frame tube’s base; refer to your service manual for details if required.

Conclusion

Performing an oil change on your 2008 Suzuki DRZ400SM is straightforward, requires just a handful of tools, and is critical to your bike’s performance and reliability. Always dispose of used oil and filters responsibly, and consult your Suzuki service manual for further recommendations if needed. With these steps and precautions in mind, you’ll keep your DRZ400SM running strong on every ride.

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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.