How to Change the Oil in a 2021 Suzuki DR-Z400SM

Shop parts for a 2021 Suzuki DR-Z400SM Dirt Bike.

Changing the oil in your 2021 Suzuki DR-Z400SM is one of the most critical maintenance tasks you can perform to keep your bike running smoothly and prolong engine life. This model shares its oil change procedure with other DR-Z400 variants, but be sure to check your owner's manual for any updates or specific recommendations. This guide is proprietary to MotoSport.com and designed for DIYers who want reliable, detailed instructions.

Tools and Materials Needed

  • Ratchet and socket set (8mm, 12mm, 17mm)
  • Torque wrench
  • Oil drain pan
  • Gloves and safety glasses
  • Clean rags
  • Funnel
  • New oil filter
  • 10W-40 motorcycle oil (2 quarts)
  • Replacement drain bolt washers (as needed)

Preparation

  • Warm up the engine for five minutes to thin out the oil, making it easier to drain completely.
  • Turn off the engine and place your bike securely on a stand or level surface.

Step-by-Step Oil Change Instructions

  • Remove the oil filler cap/dipstick from the top of the frame. This allows the system to vent, helping the oil drain smoothly.
  • Drain the engine oil from the crankcase. Position your drain pan under the engine and remove the 17mm drain bolt and washer from the bottom of the crankcase. Allow all oil to drain completely.
  • Check the bolt and washer for wear. Replace the washer if it's deformed or damaged. Reinstall the drain bolt and torque it to 15 ft-lbs.
  • Drain the frame oil. Locate the 12mm drain bolt and washer at the lower part of the frame (just forward of the engine). Remove it and allow the remaining oil to drain into the pan.
  • Inspect and replace the washer on the frame drain bolt if necessary. Reinstall and torque the frame drain bolt to spec.
  • Replace the oil filter. Use the appropriate socket (8mm or as required) to remove the oil filter cover. Pull out the old filter, making sure the sealing surfaces are clean. Install the new oil filter in the correct orientation (follow the “arrow up” if marked).
  • Reinstall the oil filter cover and torque the bolts evenly.
  • Add new oil. Using a clean funnel, pour in 10W-40 motorcycle oil. For the DR-Z400SM, the official capacity is about 1.8 liters (1.9 quarts) with filter change, but most riders round up to 2 quarts for simplicity.
  • Reinstall the dipstick oil cap and start the engine. Let it idle for several minutes then shut it off and wait a couple of minutes for the oil to settle.
  • Check the oil level using the dipstick. Top off if necessary, but do not overfill.
  • Reinstall skid plate if equipped.
  • Dispose of old oil and filter responsibly at a recycling center.

2021 DR-Z400SM Model-Specific Callouts

  • The DR-Z400 line has used similar oil change procedures since 2000, but always confirm O-rings and washers are not reused unless specified by Suzuki.
  • Use only JASO MA-rated motorcycle oils; avoid automotive oils as they may damage the clutch.
  • Some years and markets may include a hidden frame filter screen (near the frame drain bolt). Clean or replace this screen during oil changes if accessible.
  • The bike does not have a separate oil reservoir; both engine and transmission use the same oil.
  • Be careful not to overtighten the drain bolts, as the engine case and frame are aluminum and can strip easily.
  • Always run the engine briefly after filling to ensure oil fully circulates, then check and adjust the level accordingly.

Maintenance Tips

  • Change oil every 3,000–3,500 miles, or more often for harsh riding conditions.
  • Inspect for oil leaks post-service and check tightness of bolts and oil filter after first ride.
  • Always use new washers on drain bolts for best sealing performance.
  • Keep a maintenance log for reference and resale value.

Maintaining your 2021 Suzuki DR-Z400SM keeps it performing at its best. For all your dirt bike parts and tools, trust MotoSport.com as your go-to resource for expertise and quality supplies.

Related Shopping Categories

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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.