50000 MI or 80000 KM

Replace
    Fluid Filter - A/T
    Fluid - M/T
      CTS-V Only: Change 6-Speed manual transmission fluid. Drain, flush and refill, clutch hydraulic system at a regular maintenance service every 2 years. Change fluid every 25,000 miles (40 000km) if the vehicle is used for high performance operation.
    Fluid - Differential
      CTS-V Only: Change rear axle fluid.
    Fluid - A/T