Cadillac CT6 Owner Manual (GMNA-Localizing-U.S./Canada-9235592) -2016 - crc - 11/6/15Service and Maintenance 349Footnotes — MaintenanceSchedule Additional RequiredServices - Severe(1) Vehicles with different size frontand rear tires do not have tirerotation. See Tire Rotation 0 313.(2) Or every two years, whichevercomes first. More frequentpassenger compartment air filterreplacement may be needed ifdriving in areas with heavy traffic,poor air quality, high dust levels,or environmental allergens.Passenger compartment air filterreplacement may also be needed ifthere is reduced airflow, windowfogging, or odors. Your GM dealercan help determine when to replacethe filter.(3) Check all fuel and vapor linesand hoses for proper hook-up,routing, and condition.(4) Or every four years, whichevercomes first. If driving in dustyconditions, inspect the filter at eachoil change or more often as needed.(5) Do not directly power wash thetransfer case and/or front/rear axleoutput seals. High pressure watercan overcome the seals andcontaminate the transfer case fluid.Contaminated fluid will decrease thelife of the transfer case and/or axlesand should be replaced.(6) Or every five years, whichevercomes first. See CoolingSystem 0 275.(7) Or every 10 years, whichevercomes first. Inspect for fraying,excessive cracking, or damage;replace, if needed.(8) Replace brake fluid every fiveyears. See Brake Fluid 0 283.Special ApplicationServices. Severe Commercial UseVehicles Only: Lubricate chassiscomponents every 5 000 km/3,000 mi.. Have underbody flushing serviceperformed. See "UnderbodyMaintenance" in ExteriorCare 0 333.
