How to Change the Oil in a Suzuki Boulevard M90

A Suzuki Boulevard M90 cruiser is all about a smooth ride, and if you want to keep it that way, it’s best change to the oil when it’s due.

Like most motorcycle oil changes, there’s no point in wasting money paying a mechanic to change it if you can do it yourself in minutes. Follow the step-by-step guide below and watch our video above to change the oil in a Suzuki Boulevard M90.

Tools and Parts Needed – Suzuki M90 Oil Change

Tools

Changing Suzuki Boulevard M90 Engine Oil

Step 1. Run the engine on idle for a minute to warm the oil and help it drain faster. Next, remove the dipstick from the left side of the crankcase, which allows the engine to breathe and also helps the oil drain faster.

Suzuki M90 oil change

Step 2. Put a drain pan under the engine, and remove the 18mm drain bolt located at the bottom of the crankcase to let the oil fully drain out.

Suzuki M90 Boulevard oil change

Step 3. Inspect the drain bolt’s crush washer, and replace it with a new one if it’s worn out. Reinstall the crush washer and drain bolt, and torque the drain bolt to 16.5 foot-pounds.

Step 4. Remove the oil filter from the lower front of the engine using a 68mm oil filter wrench

NOTE: Have shop towels or rags ready to catch any oil that spills from the old filter as it’s removed.

Suzuki M90 Boulevard oil filter change

Step 5. Lightly oil the new oil filter’s O-ring with engine oil, then install the new oil filter and torque it to 14.5 foot-pounds.

Suzuki Boulevard M90 oil filter

Step 6. Refill the engine with 3.4 quarts of Suzuki Ecstar 10W-40 motorcycle oil.

Suzuki Ecstar 10W-40 motorcycle oil

Step 7. Reinstall the dipstick, and run the engine for about 15 seconds to circulate the new oil through the engine. Next, shut off the engine and let the oil settle for a minute.

Step 8. Remove the dipstick, wipe away any oil and set it back in the crankcase without threading it back in. Next, lift out the dipstick again and check the oil level. Finally, top off the oil level if necessary, reinstall the dipstick and you’re done!

Suzuki M90 motorcycle oil change

Since you’re already changing out the engine oil on your Suzuki M90 Boulevard, why not change the rear diff fluid while you’re at it? 

Watch the video above to see how to change the final drive oil on a Suzuki M90. 

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