Maintaining your vehicle’s transmission includes changing its fluid regularly. There are two popular fluid replacement methods, either a transmission flush or a drain and fill. What are the differences between the services, and which is best for your vehicle?
What Is A Transmission Flush?
Most drivers can expect a proper transmission flush to take between 3-4 hours to complete. The auto care professionals will perform a flush using a commercial flushing machine or pump inlet.
A transmission fluid change, meanwhile, can be completed in just 30 minutes. The fluid change involves removing the transmission pan and cleaning out any older fluid that built up in the transmission over time.
What Is A Drain And Fill?
The drain and fill method is a much simpler process when compared to a complete flush. This process includes removing the drain pan to release old fluid. Once drained, new transmission fluid will be added to your system.
Unlike a full flush, though, a drain and fill only removes nearly 30-50% of the old fluid. When choosing this service, the fluid used in the torque converter and cooler lines usually stays within the system.
Signs You Need A Transmission Flush
Transmission fluid is a crucial component to keeping your vehicle operating at its very best. For this reason, it is recommended to have your transmission fluid both flushed and replaced regularly.
Typically, this service will be done every 30,000-60,000 miles. However, factors like make, model, climate, and driving style can alter the timeline. Keep an eye out for any of the following signs that indicate low transmission fluids:
- Check engine or transmission warning light is on.
- Poor acceleration.
- Unusual noises.
- Transmission leaks.
- Burning smell.
- Slow gear engagement.
- Slipping gears.
How Often Do You Need A Transmission Flush?
The auto care professionals strongly recommend that you change your transmission fluid every 30,000 miles or every 2 years. Reference your owner’s manual for recommendations about transmission flush frequencies.
Transmission Flush Vs Drain And Fill Differences
Here is a quick breakdown of the differences between a transmission flush and a drain and fill:
| Transmission Flush | Drain and Fill |
| Completely removes old fluid, cleans out dirt, debris, and sludge. | Removes 30-50% of fluid but is not a cleaning method. |
| A longer process to complete, approximately 1-2 hours. | Can be completed within 30-60 minutes. |
| More expensive because of the equipment needed. | Less expensive due to decreased labor needs. |
| Best for older, high-mileage vehicles. | Part of routine maintenance for newer vehicles. |
Which Service Is Best For Your Car?
A transmission flush is called for when vehicles have high mileage, failing transmission signs, or have neglected fluid needs in the past. A flush will remove dirt, debris, built-up sludge, which calls for a more thorough cleaning. This is also ideal for vehicles used for towing or other heavy-duty needs.
Drain and fill service is undoubtedly better for newer models. This service is gentler on the transmission because it will not force the old fluid out. A drain and fill will suffice for regular maintenance needs on a low-mileage vehicle.
Your decision between these two services ultimately comes down to the condition the car’s transmission is currently in. If the vehicle has been well-maintained over its lifespan, a drain and fill is typically all drivers will need. Vehicles featuring high mileage or experiencing transmission problems, may opt for a flush.
Always check with your trusted local auto care professionals to see which service is right for your vehicle.
Heath’s Auto Service In Scottsdale, AZ
At Heath’s Auto Service, we offer a comprehensive range of services and repairs to meet all your automotive needs. From routine maintenance like oil changes and tire rotations to more complex repairs involving brake systems, engine diagnostics, and transmission issues, our highly skilled technicians are equipped with the latest tools and technology to ensure your vehicle is serviced to the highest standards. Contact our team today!
