Cadillac CTS 2014 Owner's Manual page 346

11-6 Service and Maintenance
Maintenance Schedule
Additional Required
Services - Normal
Rotate tires, if recommended for the vehicle, and
perform Required Services. Check engine oil level
and oil life percentage. Change engine oil and
filter, if needed. (1)
Replace passenger compartment air filter. (2)
Inspect evaporative control system. (3)
Replace engine air cleaner filter. (4)
Replace spark plugs. Inspect spark plug wires.
(2.0L LTG and 3.6L LF3 Turbo Engines)
Replace spark plugs. Inspect spark plug wires.
(3.6L LFX Engine Only)
Change automatic transmission fluid. Change
filter if serviceable.
Change transfer case fluid, if equipped with
AWD. (5)
Change rear axle fluid, if equipped with electronic
limited slip differential. (3.6L V6 Turbo LF3
Engine only)
Drain and fill engine cooling system. (6)
Visually inspect accessory drive belts. (7)
Replace brake fluid. (8)