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Is a Transmission Flush Really Necessary?

Is a Transmission Flush Really Necessary? | Nerger's Auto Express

Transmission maintenance is one of those things that car owners often overlook until it's too late. But when it comes to keeping your vehicle running, few things are as important as a well-maintained transmission. Among the various maintenance tasks, technicians often recommend a transmission flush. But is it really necessary?

The Transmission in a Car

Before we can decide if a transmission flush is necessary, it's important to understand what the transmission does. Essentially, the transmission transfers power from the engine to the wheels, allowing your car to move at different speeds. There are two main types of transmissions: manual and automatic. Regardless of the type, the transmission contains a complex system of gears and components that require clean, high-quality transmission fluid to function properly.

What is a Transmission Flush?

A transmission flush involves removing all the old transmission fluid from your vehicle and replacing it with fresh fluid. This process is more comprehensive than a simple fluid change, as it also involves cleaning the transmission cooler lines and sometimes using a special machine to ensure that every drop of old fluid is removed. The idea is to eliminate any contaminants and deposits that could harm the transmission's performance and longevity.

Signs You Might Need a Transmission Flush

So, how do you know if your car needs a transmission flush? Here are some telltale signs:

  • Slipping Gears: If your car is slipping in and out of gear or having trouble shifting, it could be due to dirty transmission fluid.
  • Unusual Noises: Grinding, whining, or clunking noises when your car shifts gears can indicate a problem with the transmission fluid.
  • Delayed Shifting: If there's a delay when shifting from park to drive or between gears, your transmission might be struggling due to old fluid.
  • Burning Smell: A burnt odor coming from your transmission fluid indicates that it's old and dirty and needs to be replaced.

Benefits of a Transmission Flush

Now that you know the signs, let's talk about the benefits of getting a transmission flush:

  • Improved Performance: Clean transmission fluid ensures that your transmission operates smoothly, reducing wear and tear on components.
  • Extended Lifespan: By keeping your transmission clean, you can significantly extend its lifespan and avoid costly repairs or replacements.
  • Better Fuel Efficiency: A well-maintained transmission can help improve your vehicle's overall fuel efficiency.
  • Prevent Overheating: Fresh transmission fluid can help keep your transmission cool, preventing overheating and potential damage.

When to Consider a Transmission Flush
While the benefits are clear, not every vehicle needs a transmission flush at the same intervals. Here's a general guideline:

Manufacturer Recommendations
Always check your vehicle's owner manual for the manufacturer's recommendations regarding transmission maintenance.

Driving Conditions
If you frequently drive in stop-and-go traffic, tow heavy loads, or drive in extreme temperatures, you might need to flush your transmission more often.

High Mileage
Older vehicles or those with high mileage may benefit from more frequent transmission flushes.


Protect your vehicle's transmission with a comprehensive flush. Schedule an appointment at Nerger's Auto Express today to ensure peak performance.

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