Cadillac XTS 2018 Owner's Manual page 316

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SERVICE AND MAINTENANCE
315
Maintenance Schedule
Additional Required Services -
Normal
Rotate tires and perform Required Services. Check
engine oil level and oil life percentage. Change
engine oil and filter, if needed.
Replace passenger compartment air filter. (1)
Inspect evaporative control system. (2)
Replace engine air cleaner filter. (3)
Replace spark plugs. Inspect ignition coils. (3.6L LFX
V6 engine)
Replace spark plugs. Inspect ignition coils. (3.6L LF3
twin turbo V6 engine)
Replace rear axle fluid, if equipped with limited-slip
differential.
Replace rear axle fluid, except limited-slip
differential.
Drain and fill engine cooling system. (4)
Visually inspect accessory drive belts. (5)
Replace brake fluid. (6)

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