VEHICLE CARE 337For 1500 Series vehicles, at least everyother oil change lubricate the outertrack rod ends.Control arm ball joints on 1500 Seriesvehicles are maintenance-free.CautionLubrication of applicable steering/suspension points should not bedone unless the temperature is−12 °C (10 °F) or higher, or damagecould result.Body Component LubricationLubricate all key lock cylinders,bonnet hinges, tailgate hinges, steelfuel door hinge and power assist stephinges, unless the components areplastic. Applying silicone grease onweatherstrips with a clean cloth willmake them last longer, seal better,and not stick or squeak.Underbody MaintenanceAt least twice a year, spring and fall,use plain water to flush any corrosivematerials from the underbody. Takecare to thoroughly clean any areaswhere mud and other debris cancollect. If equipped with power assiststeps, extend them and then use ahigh pressure wash to clean all jointsand gaps.Do not directly power wash thetransfer case and/or front/rear axleoutput seals. High pressure water canovercome the seals and contaminatethe fluid. Contaminated fluid willdecrease the life of the transfer caseand/or axles and should be replaced.Sheet Metal DamageIf the vehicle is damaged and requiressheet metal repair or replacement,make sure the body repair shopapplies anti-corrosion material toparts repaired or replaced to restorecorrosion protection.Original manufacturer replacementparts will provide the corrosionprotection while maintaining thevehicle warranty.Finish DamageQuickly repair minor chips andscratches with touch-up materialsavailable from your dealer to avoidcorrosion. Larger areas of finishdamage can be corrected in yourdealer's body and paint shop.Chemical Paint SpottingAirborne pollutants can fall upon andattack painted vehicle surfacescausing blotchy, ring-shapeddiscolourations, and small, irregulardark spots etched into the paintsurface. See “Finish Care” previously inthis section.Interior CareTo prevent dirt particle abrasions,regularly clean the vehicle's interior.Immediately remove any soiling.Newspapers or dark garments cantransfer colour to the vehicle's interior.Use a soft bristle brush to removedust from knobs and crevices on theinstrument cluster. Using a mild soapsolution, immediately remove hand