Transmission fluid keeps the moving parts inside your gearbox lubricated and carries heat away from them, and in an automatic it also creates the hydraulic pressure that changes gear for you.
Over time, heat and tiny particles from normal wear break the fluid down, which can leave your gear changes slow, jerky or noisy.
Changing it is routine maintenance that helps keep your gear changes smooth and protects your gearbox from extra wear, and you can compare local garages and arrange an appointment in seconds, without paying anything when you book.
If you drive a vehicle with a direct-shift gearbox, you can book a DSG oil change instead.
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Your car's transmission fluid may need to be changed if you notice:
An illuminated check engine or transmission warning light
Slipping gears
Delayed shifting
Strange noises when the car is in gear
Jerking movement
A burning smell
Ensuring your car has fresh fluid is one of the simplest ways to look after your gearbox, and booking it takes hardly any time at all.
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