How to Change the Oil in a 1993 Suzuki DR350

Shop Parts for a 1993 Suzuki DR350 Dirt Bike.

Changing the oil in your 1993 Suzuki DR350 is critical for the longevity and performance of your dirt bike. This motorcycle features a dry-sump oil system, which requires draining not only the engine crankcase but also the frame’s oil reservoir. Here’s a comprehensive, MotoSport.com-proprietary guide to get the job done right, with specific call-outs for your model and year.

Tools and Supplies Needed

  • 17mm, 12mm, 10mm, and 19mm wrenches or sockets
  • 8mm wrench or socket (sometimes needed for side covers)
  • Flathead screwdriver
  • Pair of needle nose pliers (optional, for oil screen if cleaning)
  • Drain pan for used oil
  • Replacement oil filter (OEM or equivalent)
  • New crush washers for drain bolts
  • Replacement O-rings for filter cover and screen/strainer (recommended)
  • 2 quarts (1.8L) 10W40 motorcycle oil (rated for wet clutch use)
  • Clean rags for cleanup
  • Torque wrench (optional, but ensures correct torque)
  • Gloves to keep hands clean and safe

Preparation

  • Warm up the engine for a few minutes to thin the oil, making it easier to drain.
  • Place the bike on a stable stand, engine off.

Step-by-Step Oil Change Process

  • Remove the Skid Plate (Optional but Recommended):
    • The 1993 DR350's dry-sump oil system routes oil through the frame, which includes an oil strainer inside the frame. Removing the skid plate, held by four 12mm bolts (two on each side), gives clear access to both the crankcase and frame drain bolts. If you are not cleaning the oil strainer, you can skip this step, but complete service is best for your bike’s health.
  • Drain the Engine Crankcase:
    • Locate the crankcase drain bolt on the bottom side of the engine. Remove it using a 17mm wrench or socket.
    • Let all the old oil drain completely into your pan.
    • Remove and replace the crush washer on the bolt to help prevent future leaks.
  • Drain the Frame Oil Reservoir:
    • Locate the frame oil drain bolt, typically near the lower front of the frame. Use a 12mm wrench or socket to remove this bolt and drain the frame oil tank into your pan.
    • Again, replace the crush washer.
  • Clean or Check the Oil Strainer (Optional but Recommended):
    • The DR350 has an oil screen/strainer inside the frame; cleaning it helps catch particles and debris. Remove with care (using needle nose pliers if needed), inspect, and clean with solvent or soap and water. Inspect the o-ring, and replace if damaged. Note: Removing and reinstalling this screen can damage the o-ring, so have a new one handy.
  • Replace the Oil Filter:
    • Remove the oil filter cover (typically three 8mm bolts).
    • Take out the old filter and replace it with a new one, making sure the rubber seal faces outward.
    • Replace or inspect both filter cover o-ring and the small inner oil filter o-ring. Leaks here can cause significant oil loss.
  • Reinstall All Drain Bolts and Skid Plate:
    • Install new crush washers (critical for preventing leaks).
    • Tighten all bolts to factory spec (if you have a torque wrench, check the DR350 service manual; roughly 16–18 ft-lbs for drain plugs is typical, but verify).
    • Reinstall the skid plate.
  • Refill Oil:
    • Add 1.8 quarts (1.7L) of 10W40 motorcycle oil (quality motorcycle-specific, wet clutch compatible) via the frame dipstick/fill cap atop the right frame down tube. Pour slowly.
  • Prime the Oil System:
    • Before starting, with the kill switch OFF, crank the engine a few times using the kick starter to help move oil through the engine and into the lines as per DR350 dry-sump practice.
  • Start and Check Oil Level:
    • Start the bike and let it run for a minute.
    • With the bike upright, check the oil level at the frame dipstick (not while on the side stand). Oil level should be between the marks; top off as needed.
  • Check for Leaks and Clean Up:
    • Inspect all drain bolts and the filter cover for leaks.
    • Wipe down and dispose of used oil/environmentally responsibly.

1993 Suzuki DR350-Specific Notes

  • This bike uses a dry-sump system; oil is stored in the frame, not just in the crankcase. Draining both the crankcase and the frame is necessary for a complete change.
  • Oil strainer in the frame is durable, but removal can damage the o-ring, so only clean as needed or if you suspect contamination.
  • Always use a motorcycle-specific 10W40 oil as the wet clutch system is sensitive to friction modifiers; avoid generic automotive oil.
  • Inspect the filter cover o-ring and the small o-ring found on the filter's inner post to prevent leaks or pressure loss.
  • Warm up the bike before draining oil for fastest, most complete drainage.

Why Complete Oil Changes Matter

The DR350 engine is known for its reliability, but fresh oil and a clean filter are the keys to longevity, especially after hard riding or in dusty environments. Skipping frame oil or oil strainer service leads to incomplete oil changes, risking premature engine wear.

Final Tips

  • Check your oil level after every ride, especially during the first couple of outings after a change.
  • Never overfill; more is not better and can harm engine seals.
  • Dispose of old oil and filters at an appropriate recycling facility.
  • Keep your MotoSport.com order log up to date so you know what was changed and when—proven to help preserve resale value and avoid skipped services.

Follow these steps, and your 1993 Suzuki DR350 will remain fast, reliable, and ready for the toughest rides. For more exclusive dirt bike maintenance guides and premium service parts, trust MotoSport.com—the power sports specialists.

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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.