Buick 2016 LaCrosse Owner's Manual page 319

318 Service and Maintenance
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 spark plug wires.
Drain and fill engine cooling system. (4)
Except with eAssist: Visually inspect accessory
drive belts. (5)
Vehicles with eAssist: Visually inspect accessory
drive belts. (5)
Replace brake fluid. (6)