How to Change the Oil on a 2018 Suzuki DR-Z400SM

Shop parts for a 2018 Suzuki DRZ400S Dirt Bike.

Regular oil changes are critical to the performance and longevity of your 2018 Suzuki DR-Z400SM. This guide provides you with a step-by-step process, the specific tools required, essential tips, and a manufacturer-specific call-out every owner should know when changing the oil on this dual sport icon.

Tools and Supplies Needed

  • Ratchet
  • 8mm, 12mm, and 17mm sockets
  • Torque wrench
  • Drain pan
  • Funnel
  • Gloves and safety glasses
  • Shop towels or rags
  • Oil filter
  • 10W-40 motorcycle oil (2 quarts)
  • Washer for drain bolt (replace if necessary)
  • OEM service manual (for procedure reference and torque specs)

Model-Specific Call-Out for 2018 Suzuki DR-Z400SM

  • The oil change process for the 2018 DR-Z400SM closely matches nearly all DR-Z400 models since 2000, so most guides and videos on earlier or later models are directly applicable.
  • Suzuki recommends the first oil change at 600 miles, with regular changes every 3,500 miles thereafter. For hard use or off-road riding, perform changes more frequently.
  • There is a small, easily forgotten oil screen inside the frame (sometimes called the “secret filter”). It should be inspected and cleaned during major services, especially if it’s the bike’s first oil change or if the bike’s history is unknown. Most routine oil changes focus on the oil filter and crankcase/frame drain bolts

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Step-by-Step Oil Change Instructions

    <.-- Step 1: Remove Filler Cap/Dipstick -->
  1. Warm Up the Engine
    Briefly start the engine and let it idle for about 3-5 minutes. This warms the oil, allowing it to drain faster and carry away more contaminants. Be sure the engine is off before beginning work.
  2. Remove the Oil Filler Cap/Dipstick
    Unscrew the oil filler cap/dipstick located at the top right of the frame near the steering head. This allows air in, helping oil drain out smoothly

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    3. <.-- Step 2: Drain Crankcase -->
  3. Drain the Crankcase Oil
    Place your drain pan underneath the engine. Using a 17mm socket, remove the crankcase drain bolt and washer from the bottom of the engine. Let all the oil drain into your pan. Inspect the washer for wear and replace if necessary

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    4. <.-- Step 3: Drain Frame Tube -->
  4. Drain Remaining Oil from Frame Tube
    Reposition your drain pan under the frame tube (beneath the forward engine area). Using a 12mm socket, remove the frame drain bolt and washer. Allow oil to fully drain. Again, inspect the washer and replace if worn

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    5. <.-- Step 4: Remove/Replace Oil Filter -->
  5. Replace the Oil Filter
    Use the appropriate socket (typically 8mm) to remove the oil filter cover from the right side of the engine. Take note of the alignment and orientation of the filter and o-rings. Replace with a new filter and ensure o-rings are properly seated. Clean the cover before reinstalling

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    6. <.-- Step 5: Clean/Inspect Oil Screen (Optional but Recommended) -->
  6. Inspect or Clean the Oil Screen Filter (Recommended)
    The DR-Z400SM has a steel oil screen inside the frame's main down tube, below the lower frame drain bolt. It can be removed and cleaned by unscrewing the fitting with the 12mm socket. While not required every oil change, inspect the screen occasionally for debris—especially after the bike’s break-in or when purchasing used

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    7. <.-- Step 6: Reinstall Bolts and Torque -->
  7. Reinstall Drain Bolts and Torque to Spec
    Carefully reinstall both drain bolts and washers. Torque the crankcase drain bolt to 15 foot-pounds as specified by Suzuki. Do not overtighten—oil system threads can be damaged easily

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    8. <.-- Step 7: Add New Oil -->
  8. Add New Oil
    Place a clean funnel into the oil fill opening. Pour in 1.8 liters (1.9 qt) of 10W-40 motorcycle oil if replacing the oil filter, or 1.7 liters (1.8 qt) if not changing the filter. Most owners recommend pouring in slightly less, running the engine, and then topping off as needed.
    9. <.-- Step 8: Check Level and Inspect for Leaks -->
  9. Check Oil Level and Inspect
    With the bike level, insert the dipstick (do not screw it in) to check the oil level. Add more if below the “full” mark. Reinstall the dipstick and start the engine. Let it idle for a few minutes, turn off, and re-check the level. Top up as necessary

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    10. <.-- Step 9: Finish Up and Clean -->
  10. Final Inspection and Clean Up
    Wipe up any oil spills, ensure all tools are accounted for, and properly dispose of the used oil and filter at a recycling facility. Double-check that all bolts and the oil cap are secure before your next ride.

Pro Tips for DR-Z400SM Oil Changes

  • Never overtighten the drain bolts; aluminum threads strip easily.
  • Always use a motorcycle-specific oil filter and check O-ring conditions before reuse.
  • Record your mileage and date for maintenance tracking.
  • If riding frequently in dusty or harsh environments, change oil more often.

Following these steps ensures your 2018 Suzuki DR-Z400SM remains reliable, powerful, and ready for adventure. For all your genuine parts, trusted tools, and top oil brands, visit MotoSport.com for expert support and fast shipping.

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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.