Cadillac CTS 2014 Owner's Manual page 348

11-8 Service and Maintenance
Maintenance Schedule
Additional Required
Services - Severe
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)
2.0L LTG and 3.6L LF3 Engines: Replace spark
plugs. Inspect spark plug wires.
3.6L LFX Engine Only: Replace spark plugs.
Inspect spark plug wires.
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)