What type of transmission oil for 2003 VOLVO S40?

For a 2003 Volvo S40, the recommended transmission oil is typically Volvo's own brand of Automatic Transmission Fluid (ATF), specifically Volvo Transmission Fluid or an equivalent ATF that meets the requirements of Dexron III or Mercon. It's important to check the owner's manual for any specific recommendations or specifications. Using the correct type of fluid is essential for optimal performance and to avoid potential damage to the transmission.