Cadillac XTS Owner's Manual page 294

Footnotes Maintenance Schedule
Additional Required Services -
Severe
(1) Or every two years, whichever
comes first. More frequent passenger
compartment air filter replacement
may be needed if driving in areas with
heavy traffic, poor air quality, high
dust levels, or environmental
allergens. Passenger compartment air
filter replacement may also be needed
if there is reduced airflow, window
fogging, or odors. Your GM dealer can
help determine when to replace the
filter.
(2) Visually check all fuel and vapor
lines and hoses for proper attachment,
connection, routing, and condition.
(3) Or every two years, whichever
comes first. If driving in dusty
conditions, inspect the filter at each
oil change or more often as needed.
(4) Or every five years, whichever
comes first. See Cooling System 0 233.
(5) Or every 10 years, whichever
comes first. Inspect for fraying,
excessive cracking, or damage; replace,
if needed.
(6) Replace brake fluid every five
years. See Brake Fluid 0 241.
SERVICE AND MAINTENANCE
Special Application
Services
Severe Conditions Requiring
More Frequent Maintenance
Public service, military,
or commercial use vehicles to
include the following:
Ambulances, police cars and
emergency rescue vehicles.
Civilian vehicles such as light
duty pick-up trucks, SUVs and
passenger cars that are used in
military applications.
Recovery vehicles such as tow
trucks and flatbed single vehicle
carriers or any vehicle that is
consistently used in towing
trailers or other loads.
High use commercial vehicles
such as courier delivery vehicles,
private security patrol vehicles
or any vehicles that operate on
a 24 hour basis.
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