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Are transmission flushes really necessary?


Transmission flushes are a common service offered by auto repair shops, but many car owners wonder if they are truly necessary or just an upsell. At Kevin's Autos, with decades of experience in car maintenance and repair, we aim to provide clarity on this topic to help you make informed decisions about your vehicle's care.


What Is a Transmission Flush?


A transmission flush is a process where all the old transmission fluid is removed from your vehicle's transmission system and replaced with fresh fluid. This service is designed to clean out debris, sludge, and contaminants that can accumulate over time, ensuring the transmission operates smoothly.


When Is a Transmission Flush Necessary?


While not every vehicle requires a transmission flush, there are specific situations where it can be beneficial. Here are some scenarios where a flush might be necessary:



  • Manufacturer Recommendation: Some car manufacturers recommend transmission flushes at specific mileage intervals. Always check your vehicle's owner's manual for guidance.

  • Contaminated Fluid: If your transmission fluid appears dark, dirty, or has a burnt smell, it may indicate contamination that a flush can address.

  • Performance Issues: Slipping gears, delayed shifting, or unusual noises from the transmission could signal the need for a flush.


When a Transmission Flush May Not Be Necessary


In some cases, a transmission flush might not be required and could even be harmful. Here are a few instances where you should proceed with caution:



  • High Mileage Vehicles: For vehicles with high mileage that have never had a transmission flush, introducing fresh fluid could dislodge debris and cause more harm than good.

  • Routine Maintenance: If your transmission fluid is clean and your vehicle is performing well, a simple fluid change (not a full flush) may suffice.


Benefits of a Transmission Flush


When performed at the right time, a transmission flush can offer several benefits:



  • Improved Performance: Fresh fluid helps the transmission operate more efficiently, leading to smoother gear shifts.

  • Extended Lifespan: Removing contaminants can prevent wear and tear, prolonging the life of your transmission.

  • Preventative Maintenance: A flush can help avoid costly repairs by addressing issues before they escalate.


Conclusion: Is It Worth It?


Ultimately, whether a transmission flush is necessary depends on your vehicle's condition, mileage, and manufacturer recommendations. At Kevin's Autos, we always prioritize transparency and customer education. If you're unsure whether your car needs a transmission flush, bring it in for an inspection. We'll assess your transmission fluid and provide honest advice tailored to your vehicle's needs.


Remember, regular maintenance is key to keeping your car running smoothly. When in doubt, consult your owner's manual or a trusted auto repair professional. At Kevin's Autos, we're here to help you make the best decisions for your vehicle!


Frequently Asked Questions

How much should a transmission flush cost?


Drivers can expect to pay $125 to $250 for a transmission fluid flush service. This is approximately twice as much as a transmission fluid change. This is due in large part to the additional fluid required. A flush will take 12 to 22 quarts, while a fluid change requires 5 to 7 quarts.



How much does a full transmission flush cost?


Drivers can expect to pay $125 to $250 for a transmission fluid flush service. This is approximately twice as much as a transmission fluid change. This is due in large part to the additional fluid required. A flush will take 12 to 22 quarts, while a fluid change requires 5 to 7 quarts.



What happens if you don't get a transmission flush?


Costly Repairs: Ignoring transmission fluid changes can result in significant damage that may require expensive repairs or even a complete transmission replacement. Decreased Performance: You may notice a decline in your vehicle's overall performance, including reduced fuel efficiency and responsiveness.



What mileage is good for a transmission flush?


Automatic: Every 60,000 to 100,000 miles
It's important to change your transmission fluid, but the type of transmission you have affects your ideal changing interval. If you drive manual, most manufacturers will recommend changing your transmission fluid every 30,000 to 60,000 miles.



Why do mechanics say not to change transmission fluid?


That bad fluid may have a “sticky” quality to it or metal flecks that act to aid friction, and if it's changed, the new fluid might cause the transmission to start slipping.



Which is better, a transmission flush or drain?


With a flush, all the old fluid is removed by a flush machine and replaced with new fluid, allowing for optimal transmission performance. A fluid change is a drain-and-refill, with some old fluid remains in the transmission after the change, which can contaminate the new fluid — and diminish performance.



Do you really need to flush transmission fluid?


Much like oil changes, transmission flushes should be performed every so often to maintain the transmission system, which you cannot drive without. If you bring your car in so our technicians can complete this service, your vehicle can stay running at its best.



What is the downside of transmission flush?


This is because excess build-up from contaminants and debris solidify and form a sludge. If too much sludge builds up in your transmission, and a transmission flush is performed, new fluid can cause stubborn sludge to loosen and cause damage to your transmission.



Do mechanics recommend a transmission flush?


Many auto manufacturers suggest having an automatic transmission flushed once every 30,000 to 100,000 miles. For a manual transmission, it usually ranges from 30,000 to 60,000 miles. It's worth noting that some manufacturers don't recommend a flush at all, at least for certain models.



Should I flush my transmission after 100k miles?


In the past, the factory-recommended interval for changing the automatic transmission fluid was typically between 30,000 and 100,000 miles, but some newer vehicles have what's referred to as “lifetime fluid.” However, there's some question as to whether never changing the transmission fluid may shorten that “lifetime.” ...


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.