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

Shop parts for a 2018 Suzuki DRZ400SM Dirt Bike.

Keeping your 2018 Suzuki DR-Z400SM in top condition relies heavily on regular oil changes. This detailed, MotoSport.com proprietary guide will walk you through every step, including the must-have tools, specific model call-outs, and troubleshooting tips so your DR-Z400SM stays running strong ride after ride.

Tools and Supplies You’ll Need

  • Ratchet and sockets (8mm, 12mm, 17mm)
  • Torque wrench
  • Drain pan
  • Funnel
  • Gloves
  • Oil filter (specific for DR-Z400SM)
  • 10W-40 motorcycle oil (2 quarts; see notes for exact fill amount)
  • Replacement drain plug washers
  • Paper towels or shop rags

Oil Type and Quantity

  • Use SAE 10W-40 motorcycle oil that meets SF or SG specifications
  • Capacity with filter change: 1.8L (1.9 US qt)
  • Capacity without filter change: 1.7L

Tip: Always check oil level after filling and engine warm-up.

Frequency

  • First oil change: 600 miles
  • Thereafter: Every 3,500 miles or as needed based on riding conditions

Step-by-Step Process

  • Warm up the bike.
    Start your DR-Z400SM and let it idle for about 5 minutes. This helps the oil drain out smoothly and completely.
  • Remove the skid plate.
    If your bike has an aftermarket or OEM skid plate, remove it to access the oil drain plugs.
  • Vent the oil system.
    Remove the oil filler cap/dipstick from the top of the frame. This vents the system and allows oil to drain easier

    .
  • Drain engine oil from crankcase.
    Place your drain pan under the engine. Remove the 17mm drain bolt and washer from the bottom of the crankcase. Let the oil fully drain out.
  • Check and replace washer.
    Inspect the drain bolt’s washer, replace if crushed or worn. Reinstall and torque the drain bolt to 15 ft-lb (or manufacturer’s spec) to avoid stripping

    .
  • Drain oil from the frame reservoir.
    Position the drain pan under the frame’s lower section. Remove the 12mm drain bolt and washer from the bottom of the frame. Allow the rest of the oil to drain completely

    .
  • Replace and torque frame drain bolt.
    Inspect and, if necessary, replace the washer. Reinstall and torque the bolt to spec.
  • Replace the oil filter.
    Remove the oil filter cover bolts (usually 8mm). Take out the old oil filter. Use a rag to clean the cover area. Install the new filter in the correct orientation. Reinstall the cover, tightening bolts evenly.
  • Clean or check “secret” frame filter screen.
    Your DR-Z400SM has a frame oil screen (sometimes overlooked). Check and clean this screen as part of major service or if you notice excessive debris in the oil (can remain untouched for most routine changes)

    .
  • Fill with fresh oil.
    With both drain bolts and new filter installed, use a funnel to pour in 1.8L (1.9 US qt) of oil (with filter change). Pour slowly and avoid overfilling

    .
  • Reinstall the oil filler cap/dipstick.
  • Start and check for leaks.
    Start the engine and let it idle for 3–5 minutes. Shut it off and check all drain plugs and the filter area for oil leaks.
  • Check oil level (important call–out).
    Allow a few minutes for oil to settle. Reinsert and remove dipstick to check if oil level is between the specified marks. Top up if needed, but do not overfill

    .
  • Reinstall skid plate and clean up.
    Wipe up any spilled oil and re-mount the skid plate.

2018 DR-Z400SM Call–outs & Tips

  • Oil has two separate drain locations: The crankcase and the main frame reservoir. Missing one is a common rookie mistake

    .
  • Replace the washer on the drain bolts for best sealing, preventing future leaks or bolt damage.
  • 2018+ models largely unchanged: Steps are nearly identical for all DR-Z400SM years, but always verify spec torque and oil amounts with your owner’s manual.
  • Hidden frame screen: Clean/check the frame’s oil filter screen during major services (or if you suspect internal engine wear), but routine changes may skip this.
  • First oil change at 600 miles is critical for engine longevity; then stick to intervals, adjusting for hard/off-road use if necessary

    .

Disposal

  • Dispose of used engine oil and filters responsibly—take them to a recycling center or auto parts store.

Regular oil changes are the #1 key to keeping your DR-Z400SM delivering top performance on every ride. Now you’re ready to tackle the job like a MotoSport.com pro.

Related Shopping Categories

Shop Motor Oil for a 2018 Suzuki DRZ400SM Dirt Bike.

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Shop Oil Drain Pans for a 2018 Suzuki DRZ400SM Dirt Bike.

Shop Tools for a 2018 Suzuki DRZ400SM Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2018 Suzuki DRZ400SM 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.