How do you change auto gear box oil for peugeot 406?

To change the automatic gearbox oil in a Peugeot 406, start by ensuring the vehicle is on a level surface and the engine is warm. Drain the old oil by removing the drain plug and let it flow into a suitable container. Next, replace the drain plug, refill the gearbox with new oil through the dipstick tube or designated fill port using a funnel, ensuring you use the correct type and quantity of oil specified in the owner’s manual. Finally, check the oil level using the dipstick and run the engine for a few minutes, rechecking and adjusting the oil level as necessary.