Mercedes automatic transmission fluid flush & replacement, made easy

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Our expert insights into automatic transmission fluid flush & replacement

What does Automatic Transmission Fluid (ATF) do?

Automatic Transmission Fluid (ATF) provides the lubrication to the moving parts, wear and corrosion protection and is there to transfer the mechanical power of the automatic transmission.

What are the symptoms of requiring an Automatic Transmission Fluid Flush & replacement?

Usually, there a few signs you can look for:

  • Transmission grinding or strange noises

  • Problems changing or selecting Gears

  • Slipping gears

  • Failure to change up or down smoothly

  • Jolts or a delay as you change from Park to Drive

  • Transmission overheat warnings

  • Transmission Control Unit warning lights

What happens when we do automatic transmission fluid flush and replacement?

  • The gearbox drain plug will be removed, or a syphon pump inserted down the filler tube.

  • The old fluid will be removed and replaced with new fresh transmission fluid.

  • Once refilled to the correct level and run through its selection routine, the vehicle will be test driven before returning it to the owner.

Daniel, from LondonDaniel, from London

Hey Fixter, how often should I have my automatic transmission fluid flushed?

Most manufacturers recommend replacing transmission fluid every 30,000 to 60,000 miles. If you tow anything, or do mostly city driving with more frequent changes of gears, it may be wise to change your ATF even more often.

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Want to learn more about Mercedes automatic transmission fluid flush & replacement?

What does Automatic Transmission Fluid (ATF) do?

Automatic Transmission Fluid (ATF) provides the lubrication to the moving parts, wear and corrosion protection and is there to transfer the mechanical power of the automatic transmission. This is why regular servicing of an automatic transmission is vital to change this fluid (and its filter where fitted) in line with manufacturers recommendation. Failure to do this can result in many issues, such as transmission overheat, solenoid failure, jerky gear changes and even total gearbox failure.

What is an Automatic Transmission Fluid Flush?

A transmission fluid flush is a process in which the fluid in an automatic transmission is flushed out of the transmission (gearbox) and replaced with new Automatic Transmission Fluid (AFT). The flushing process, when done correctly, replaces nearly 100% of the old fluid with new fluid, including fluid in the torque converter and oil cooler lines.

Mercedes-Benz

Mercedes-Benz is a German global car manufacturer and a division of Daimler AG. They were established over 100 years ago in 1926 and have grown to be the biggest selling premium vehicle brand in the world.

The number of Mercedes cars on the road in the UK continues to rise, reaching 1.9million by the final quarter of 2018. There are almost 5 times as many Mercedes cars on the road as there were in 1995, showing just how popular this marque has grown to be.

Helping these powerful statistics on their way, the Mercedes A-Class was announced as the 8th best selling car in the UK in 2018. The premium family hatchback is vying for position against the ever-popular VW Golf—the current leader in this class.

Premium executive models of every shape and size

Mercedes deliver hatchbacks, saloons, estates and coupés at every size from their A- to E-Class ranges, as well as executive SUVs, the V-Class MPV, and of course, a more than desirable selection of convertibles and roadsters.

With prices rising to well over £100k, Mercedes cars are a great contender as the executive car of choice.

Mercedes-Benz: Giants of Formula One

Mercedes has always been a keen player within the F1 championship, taking their first 2 titles back in 1954 and 1955. Through the 1990s they joined forces with McLaren as an engine provider and part owner, bringing titles for both Mika Häkkinen and Lewis Hamilton and a constructors championship in 1988.

Their current and outright domination of the sport began in 2014, as a team in their own right, it has featured 5 straight constructors titles, with Lewis Hamilton taking 4 world championships and Nico Rosberg taking the other in 2016.

How often should I have my automatic transmission fluid flushed?

Most manufacturers recommend replacing transmission fluid every 30,000 to 60,000 miles. If you tow anything, or do mostly city driving with more frequent changes of gears, it may be wise to change your ATF even more often.

What happens during an automatic transmission service?

There are many different processes required depending on the manufacturer, some of which may include all the following or just some:

  • Mechanics will raise the vehicle and increase the gearbox temperature if required by the procedures.

  • The gearbox drain plug will be removed, or a syphon pump inserted down the filler tube.

  • If the vehicle has a filter, the sump is likely to be removed so the filter can be accessed.

  • The parts will then be cleaned before a new filter is installed and the sump refitted with a new gasket or sealing compound.

  • The gearbox will then be refilled with the correct ATF for the gearbox and application in accordance with the manufacturer's procedure.

  • In some cases the refilling operation requires diagnostic input as well as manual.

  • Once refilled to the correct level and run through its selection routine, the vehicle will be test driven before returning it to the owner.

What are the symptoms of requiring an Automatic Transmission Fluid Flush & replacement?

Usually, there a few signs you can look for:

  • Transmission grinding or strange noises

  • Problems changing or selecting Gears

  • Slipping gears

  • Failure to change up or down smoothly

  • Jolts or a delay as you change from Park to Drive

  • Transmission overheat warnings

  • Transmission Control Unit warning lights

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