1. Replace the oil filter as required
The general oil filter manual specifies the replacement cycle, some replace based on time, while others replace based on mileage traveled. Generally, if a diesel engine has been in use for more than six months or has traveled more than 5000 kilometers, the oil filter should be replaced

2. Change the oil filter when changing the oil
Generally, when changing the engine oil, replace the oil filter at the same time

3. Replace the oil filter when it is found to be faulty
If the oil pressure is found to be too high or too low, or if the oil filter bypass valve is open, check if the oil filter has failed. If it is confirmed to be ineffective, it should be replaced in a timely manner.