How do you change rover 75 auto gear box oil?

To change the automatic gearbox oil on a Rover 75, first ensure the vehicle is on a level surface and the engine is warm. Remove the oil pan or drain plug to let the old oil drain out completely. Replace the drain plug, then refill the gearbox with the appropriate new oil through the dipstick tube or fill plug, using a funnel. Be sure to check the oil level with the engine running and adjust as necessary, ensuring it is within the recommended range.