SERVICE AND MAINTENANCE 321city traffic in hot weather, in hillyor mountainous terrain, whenfrequently towing a trailer,or when used for taxi, police,or delivery service.Additional Maintenance Every80 000 km. Visually check all fuel and vapourlines and hoses for properattachment, connection, routing,and condition.. Rear axle fluid — replace,if equipped with limited slipdifferential.Additional Maintenance Every96 000 km. Spark plugs — replace.Additional Maintenance Every120 000 km. Rear axle fluid — replace, (severeservice) vehicles without limitedslip differential.Additional Maintenance Every161 000 km. All-wheel-drive vehicles only:Transfer case fluid change. Duringany maintenance, if a powerwasher is used to clean mud anddirt from the underbody, do notdirectly power wash the transfercase and/or front/rear axle outputseals. High pressure water canovercome the seals andcontaminate the fluid.Contaminated fluid will decreasethe life of the transfer case and/ordrive axles and should be replaced.Additional Maintenance Every240 000 km. Rear axle fluid — replace, (normalservice) vehicles without limitedslip differential.Additional Maintenance Every250 000 km. Engine cooling system drain andrefill. Or every five years,whichever occurs first.Conditions Requiring More FrequentMaintenance (Severe Service). Extreme temperatures.. Heavy city traffic.. Hilly or mountainous terrain.. Dusty, muddy, or off-roadconditions.. Commercial use or trailer towing.. Most trips less than 6 km.