Where do you add transmission oil to a 2003 Audi A4?

To add transmission oil to a 2003 Audi A4, locate the transmission dipstick or fill plug, which is usually found near the back of the engine bay on the driver's side. You may need to remove the dipstick or plug using a wrench. Use a funnel to pour the appropriate Transmission Fluid into the dipstick tube or fill hole, ensuring you use the correct type of fluid specified in the owner's manual. It's important to check the fluid level with the engine running and the transmission in park or neutral for accurate measurement.