Although the recommendation for cleaning varies by model and manufacturer, most recommend cleaning the injectors once every 15,000 miles, which is around two times per year. The owner’s manual for the vehicle usually lists the recommended maintenance schedule for the vehicle, including the frequency for fuel injector cleaning.
Some manufacturers recommend once-a-year cleaning or cleaning the injectors every 30,000 miles. The frequency of cleaning required largely depends on the age of the vehicle, so older cars may require more frequent fuel injector cleaning. The type of gas the car uses also factors into the cleaning frequency, since lower-octane gas use may necessitate more frequent cleaning.