How to Change the Oil in a 1994 Suzuki DR350: A Complete Guide

Shop parts for a 1994 Suzuki DR350 Dirt Bike.

Changing the oil in your 1994 Suzuki DR350 is a crucial maintenance task to keep your dual-sport running its best. This guide, proprietary to MotoSport.com, provides step-by-step instructions, a list of required tools, and highlights important model-specific call-outs for the DR350’s unique dry-sump system. Whether you're an experienced rider or new to wrenching, follow these procedures every few rides or at recommended maintenance intervals.

Tools and Supplies Needed

  • 17mm, 12mm, 10mm, and 19mm wrenches or sockets
  • 8mm wrench or socket
  • Flat-head screwdriver
  • Needle-nose pliers
  • Drain pan
  • New oil filter (recommend OEM or equivalent such as HiFlo; check owner's manual for part number)
  • Fresh oil: 10W-40 motorcycle-specific oil (about 2 quarts/liters)
  • New crush washers (for oil drain bolts)
  • Rags and gloves
  • Socket extensions (optional)

Model-Specific Call-Outs for the 1994 Suzuki DR350

  • The DR350 uses a dry-sump lubrication system: both the engine and frame store oil, so two locations need to be drained.
  • The oil filter is easily accessible on the right side of the engine.
  • There’s an oil screen filter inside the frame. Clean this at least every few oil changes or if you suspect contamination.
  • Removing the skid plate (4x 12mm bolts) is recommended for full oil changes and to access the frame drain/oil screen.
  • Always use motorcycle-specific oil (JASO MA) to prevent clutch slippage.

Step-by-Step: How to Change the Oil

  1. Warm Up the Engine
    Let the DR350 idle for a few minutes. This helps suspend contaminants and thins the oil for easier draining.
  2. Remove the Skid Plate (if performing a full change/cleaning the oil screen)
    Use a 12mm socket or wrench to take off the 4 bolts holding the skid plate, set it aside for reinstallation.
  3. Drain the Engine Oil
    Place the drain pan under the engine, use a 17mm wrench or socket to loosen the drain bolt at the bottom of the crankcase. Remove the bolt and allow all oil to drain. Replace the crush washer if needed.
  4. Drain the Frame (Dry Sump) Oil
    Locate the oil drain bolt on the frame’s down tube (under the steering head or just ahead of engine, depending on model year). Use a 12mm wrench or socket to remove and drain the frame oil. Replace the crush washer here too. Be careful not to overtighten bolts, as the frame threads are softer.
  5. Clean the Oil Screen (Recommended but Not Required Every Change)
    Use pliers to remove the oil line clamp and slide out the banjo bolt to access the oil screen on the frame. Gently clean it with solvent and reinsert.
  6. Replace the Oil Filter
    Use an 8mm wrench or socket to remove the three or four bolts on the oil filter cover (right side of engine). Remove the old filter, wipe the cavity clean, install the new filter (oriented correctly)–usually the rubber ring faces out. Lightly lubricate the cover seal with fresh oil before reinstalling.
  7. Double-Check All Bolts
    Reinstall and torque the drain bolts, oil line clamps, and oil filter cover bolts snug–not overtightened.
  8. Add Fresh Oil
    Remove the oil filler cap (on the frame, usually near handlebars) and add 1.8–2.0 quarts of 10W-40 motorcycle oil. Use a funnel to avoid spills.
  9. Prime the Oil System & Top-Up
    With the bike off, use the kickstarter or starter to spin the motor over a few rotations–this helps fill all oil passages. Check the oil level with the dipstick, wipe, reinsert, and check again. Top up if necessary.
  10. Check for Leaks
    Start the engine and let it idle for a few minutes. Check all drain and filter areas for leaks. Stop the engine and check the oil level again, topping up as necessary.
  11. Reinstall Skid Plate
    Reattach the skid plate with its four bolts, making sure not to pinch any oil or wiring lines in the process.
  12. Dispose of Old Oil Properly
    Bring used oil and filter to a recycling center or auto parts store that accepts waste oil.

Troubleshooting & Tips for the 1994 DR350

  • If the oil level fluctuates after the change, re-check after your next ride—dry-sump systems distribute oil after running.
  • Avoid overtightening drain bolts; frame threads can strip more easily than those in an oil pan.
  • Use the correct oil filter—the wrong size can block passages or fail to seal.
  • Watch for excessive metal in the oil screen, which could signal engine wear.

Conclusion

Properly changing the oil in your 1994 Suzuki DR350 is straightforward with the right tools and a little attention to detail. Regular service extends the life of your engine and ensures reliable performance on all your adventures. For quality parts, filters, and motorcycle-specific oils, trust MotoSport.com to keep your DR350—and every ride—running strong.

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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.