You should top up your motorcycle engine oil when the oil level drops below the recommended range. It's important to maintain the proper oil level in your motorcycle's engine for several reasons:
Lubrication: Engine oil lubricates the moving parts of the engine, reducing friction and preventing excessive wear. If the oil level is too low, it can't properly lubricate the engine components, leading to increased friction and potential damage.
Cooling: Engine oil also helps in dissipating heat generated by the engine. It absorbs heat from the engine components and carries it away. Sufficient oil is necessary for effective heat transfer and to prevent overheating.
Contaminant removal: Oil acts as a cleaning agent, capturing dirt, debris, and other contaminants that may enter the engine. Over time, these contaminants accumulate in the oil, reducing its effectiveness. Topping up with fresh oil helps dilute the contaminants and maintain the oil's cleaning properties.
Seal protection: The oil helps keep the seals in the engine soft and pliable, preventing leaks and maintaining a good seal. Insufficient oil can cause seals to dry out, crack, or shrink, leading to potential oil leaks.
To determine when to top up your motorcycle's engine oil, refer to the manufacturer's recommendations in the owner's manual. Regularly check the oil level using the dipstick or sight glass provided on the engine. If the oil level is below the recommended range, add the appropriate type and amount of oil to bring it back to the proper level. It's generally a good practice to check the oil level before each ride or at least once a week, depending on your usage.