Callagy Automotive & Smog recommends changing your vehicle's transmission fluid every 3years/36,000 miles. Our technicians recommend you bring your vehicle to our Santa Rosa transmission service and repair shop once a year for a fluid change. If your vehicle is older, or you use it for hauling heavy loads and/or towing, it may be required more frequently. To determine if a fluid change is needed, Callagy Automotive & Smog recommends an external diagnostic service. This includes checking the level and condition of your transmission fluid, a road test, and putting your car on a lift at our Santa Rosa shop to check your external transmission controls and to keep your transmission, and your vehicle, performing properly. Use our online appoinment form to schedule an appointment now!