Book an Automatic Transmission Fluid Change for your Mercedes

Why choose the RAC for an automatic transmission fluid top-up?

At the RAC, we've got over 125 years' experience helping UK drivers. We have the skills and knowledge to keep your vehicle running. We'll give you results you can rely on at a price you can afford.

Automatic Transmission Fluid Change for Mercedes vehicles requires specialist tools and workshop facilities, so this work is completed through the RAC Approved Garage Network. Our approved garages service models such as A-Class, C-Class, GLC, E-Class, and EQA, following manufacturer procedures, certified equipment standards and rigorous quality checks. You receive transparent pricing, progress updates and RAC‑backed guarantees.

Close up of an RAC Mobile Mechanic underneath a car

Book an automatic transmission fluid replacement

To help make sure you’re getting smooth gear shifts and a long transmission life you need to maintain your automatic transmission fluid. So when you need to, make sure you have that old fluid drained and refilled at an RAC Approved Garage.

Quality work

Any work done will meet the high standards set by the RAC.

Exceptional customer service

We’re friendly, straightforward and jargon-free

A mechanic inspecting the underside of a vehicle.

Book a diagnostic

A mechanic will check your car for faults and talk you through any repairs you might need. There are various ways to check for faults, which could include a physical examination or plugging in to check your car’s onboard engine management system.

Diagnostic check

We’ll look for any mechanical or electrical problems. If we need to, we’ll also check your car’s onboard engine management system. Depending on your car and issue, this will usually include: – Engine – Power steering – Brakes – Transmission – Exhaust system – Fuel injection system – Cooling system and air flow – Sensors

And it’s not just automatic transmission fluid replacements that we can do for your Mercedes

RAC Approved Garages offer MOTs and services. Our professional mechanics have the expertise and experience to make sure your vehicle is operating safely and efficiently – results you can rely on at a price you can afford.

A close up of an RAC mobile mechanic looking under the hood of a car

Try one of our RAC Approved Garages

View all garages

PGS Garage Services

4.4/5

PGS Garage provides MOT testing, car servicing and vehicle repairs for customers in Portchester and surrounding areas. Catering to all types of vehicles and specialising in all makes and models of vehicle, we provide top-quality car services at great prices. Customers of PGS Garage will get the best of both worlds with the experience of a long-established business and the top-of-the-range facilities from a brand new purpose-built facility which includes all the modern technology you would expect for a top spec garage. PGS Garage has been established for more than 40 years in Purbrook and surrounding areas but has recently relocated to brand new premises in Portchester, providing state-of-the-art equipment and an extra bay to enable even more of our customers to benefit from the services.

1A Hamilton Road, Castle Trading Estate, Portchester, PO6 4QE

Mobile Mechanics and Tyres

4.8/5

Services provided: -- Can build and assemble machines or mechanical components according to requirements -- Able to Inspect machines, engines, transmissions etc. and run diagnostic tests to discover functionality issues -- Will aim to troubleshoot reported problems and resolve them in a timely manner -- Will perform thorough maintenance on machinery, equipment and systems -- Will clean and apply lubricants to components -- Will replenish engine fluids and components -- Will provide consultation on correct maintenance and preventative measures -- Can also undertake other duties (e.g. repair of hydraulic systems) -- Can provide logs of work and report on issues Experience: Proven experience as Mechanic for 12 years. Excellent knowledge of machinery and hydraulic, electrical and other systems and their components. Experienced in using various precision tools (I have equipment to perform most mechanical work). Will follow established procedures and practices with a strong commitment to health and safety. Very good communication skills with problem-solving capabilities. Very good physical strength and stamina Qualifications: BTEC national diploma motor vehicles (2 year course) HNC motor vehicles (1 year course) HND motor vehicles (1 year course) IMI (Institute of the Motor Industry) MOT Certification NT / AE / Site Manager Classes of Vehicles tested: Class Descriptionwheeled vehicles (over 450kg unladen weight) 4 Cars (up to 8 passenger seats) 4 Motor caravans 4 Quads (max unladen weight 400kg - for goods vehicles 550kg and max net power of 15kw) 4 Dual purpose vehicles 4 Private hire and public service vehicles (up to 8 seats) 4 Ambulances and taxis 4 Private passenger vehicles and ambulances (9 to 12 passenger seats) 4 Goods vehicles (up to 3,000kg design gross weight) 4a Class 4 vehicles (9 to 12 passenger seats) with a seat belt installation checkPrivate passenger vehicles and ambulances (13 to 16 passenger seats) 5 Private passenger vehicles and ambulances (more than 16 passenger seats) 5 Playbuses 5a Class 5 vehicles (13 to 16 passenger seats) with a seatbelt installation check 5a Class 5 vehicles (more than 16 passenger seats) with a seatbelt installation check 7 Goods vehicles (over 3,000kg up to 3,500kg design gross weight

Unit 4, Red Rose Trading Estate, Lancaster Road, Barnet, EN48BZ

Eastlake Garage

4.7/5

We are a well-established company with two sites in the local area, which have been in operation since 1999. We are AA, RAC and GREEN FLAG certified and are able carry out their breakdown and repair work and warranty work, as well as being Trading Standards approved and members of the Motor Ombudsman adhering to their strict code of conduct at all times. We are also Afilliated with the IMI We can offer our customers a free vehicle collection and delivery service within 10 miles of the garages, and we also offer discounts to NHS and Emergency Service staff members upon valid photographic identification.

Gaens Quarry, Porthcawl Road, South Cornelly , Bridgend, CF334RN

Sahibs Auto Electric

4.0/5

We are London's go to centre for MOT, Servicing, Alternators, Starter Motors and Car Diagnostics. We pride ourselves in Car Electrics and are well renowned for are specialists in Car Alternators and Car Starter Motors. Established in 1980, we have nearly 40 years of trusted experience the industry.

3 Norbreck Parade, London, NW107HR

DK Auto Repair

5.0/5

At DK Auto Repair, we are a team of skilled and certified automotive technicians dedicated to providing the highest level of service. Our goal is to take the stress out of auto repair by offering transparent, honest, and affordable solutions. Whether you’re in need of routine maintenance, major repairs, or emergency services, we are here to get you back on the road as quickly and safely as possible. Clutch repairs Electrical repairs Timing belts and chains Head gasket replacement Suspension and brakes Free vehicle check Injector refurbishment Bodywork repairs

Unit 3, Oak Lane, Littleport, CB61RS

Frequently asked questions about automatic transmission fluid change

How often should automatic transmission fluid be changed?

Automatic transmission fluid should be changed every 30,000 to 60,000 miles. However, always check your vehicle’s manual for the manufacturer’s recommendation. Your driving habits and the conditions you drive in will affect how quickly your fluid degrades. Regular checks and following the manufacturer’s guidelines will help to make sure your transmission stays in good condition.

Why do people say never change transmission fluid?

Some people believe that changing old transmission fluid can cause issues, especially in high-mileage vehicles. This myth stems from the fact that when automatic transmission fluid is changed, the new fluid can sometimes dislodge debris, causing problems. However, this is usually due to debris build-up.

What happens if you don’t change automatic transmission fluid?

If you don’t change the automatic transmission fluid, it can become contaminated and lose its effectiveness, leading to transmission wear and potential failure. Over time, dirty automatic transmission fluid can cause increased friction, overheating, and significant transmission damage. Regular changes will help you avoid costly repairs and keep the transmission running smoothly.

How do I know that the automatic transmission fluid has been changed recently?

Fresh automatic transmission fluid is bright red and clear. If your fluid looks clean and smells fresh, it’s been changed recently. You can also check the service records for confirmation. If in doubt, ask your mechanic to check.

What are the signs that I need an automatic transmission flush?

Signs that you might need a transmission flush include:

Slipping gears: The transmission struggles to stay in gear.
Delayed gear engagement: There’s a noticeable delay when shifting gears.
Overheating: The transmission becomes excessively hot.
Unusual noises: Grinding or whining sounds from the transmission.
Dirty fluid: The automatic transmission fluid is dark or discoloured.

A flush can help remove contaminants and restore the fluid’s effectiveness.

Can I change the automatic transmission fluid myself?

It’s often best to have a professional do it. The process can be messy and requires proper disposal of old fluid. Professional services also include checks and diagnostics to ensure everything is working.

What’s the difference between transmission fluid and gearbox oil?

Transmission fluid is used in automatic transmissions, while gearbox oil is used in manual transmissions. They’re made to do different jobs, so they’re not interchangeable. Automatic transmission fluid is designed for the hydraulic and cooling needs of automatic transmissions, while gearbox oil provides the necessary lubrication for manual transmissions.

What is an automatic transmission flush?

An automatic transmission flush is a service where all the old automatic transmission fluid is removed, and new fluid is added. It helps remove contaminants and old fluid that might be stuck in the transmission. It’s more thorough than a simple fluid change and can help restore the transmission’s performance.

Is an automatic transmission fluid change necessary?

Yes, changing the automatic transmission fluid is necessary to keep your vehicle’s transmission running well. Over time, the fluid degrades and becomes less effective, leading to potential transmission problems. Regular changes help the transmission run smoothly and can prevent costly repairs down the line.

How can I extend the life of my automatic transmission fluid?

To extend the life of your automatic transmission fluid:

Regular maintenance: Follow the manufacturer’s guidelines for fluid changes.
Avoid excessive heat: Don’t overload your vehicle or tow heavy loads when you don’t have to.
Check for leaks: Regularly inspect your vehicle for fluid leaks.
Smooth driving: Avoid aggressive driving habits that can overheat the transmission.

Proper care and regular upkeep can significantly extend the life of your automatic transmission fluid and transmission.

How long does an automatic transmission fluid change take?

An automatic transmission fluid change will typically take about 1 to 2 hours, depending on the vehicle and the service provider. This includes draining the old fluid, replacing the filter (if necessary), and refilling with new fluid. If more services or diagnostics are needed, it could take longer.

What should I do if my transmission fluid is low?

If your transmission fluid is low:

Check for leaks: Look for any visible leaks under the car.
Top up the fluid: Use the right type of fluid for your vehicle.
Monitor the fluid level: Regularly check the fluid level to make sure it stays within the recommended range.
Consult a mechanic: If the fluid level continues to drop speak to a mechanic so that they can inspect and fix any issues.