Owner's Manual
Page 450
... the transfer case output seals. Contaminated fluid will decrease the life of the transfer case and should be replaced. (r) Change transfer case fluid if the vehicle is important to help ensure vehicle safety, dependability, and emission control performance. Your dealer.../retailer can overcome the seals and contaminate the transfer case fluid. See Engine Oil on CTS-V models, check the intercooler coolant level. Windshield Washer Fluid Level Check Check the windshield washer fluid level in Recommended ...
... the transfer case output seals. Contaminated fluid will decrease the life of the transfer case and should be replaced. (r) Change transfer case fluid if the vehicle is important to help ensure vehicle safety, dependability, and emission control performance. Your dealer.../retailer can overcome the seals and contaminate the transfer case fluid. See Engine Oil on CTS-V models, check the intercooler coolant level. Windshield Washer Fluid Level Check Check the windshield washer fluid level in Recommended ...