- The correct approved fluid
- ATF, CVT fluid, dual clutch fluid and manual gear oil are not interchangeable categories. Match the required manufacturer specification to the exact gearbox, rather than choosing by color or viscosity alone.
- The right filter and seals
- Some units have a replaceable filter, some use a filter integrated into the pan, and others have different service arrangements. Ask what is accessible and required on your car.
- A vehicle specific level check
- Some gearboxes require a specified fluid temperature and operating sequence when setting the level. Filling with an assumed number of liters can leave the unit overfilled or underfilled.
- A useful service record
- Keep the invoice showing the fluid specification, quantity supplied, replacement parts and mileage. Confirm any required service reset or procedure rather than assuming every gearbox needs an adaptation reset.