HOSE-RDTR(UPR) 5024191 - Caterpillar

... Add a MINIMUM of 30%, but NO more than 60%, of Caterpillar antifreeze to the good quality water to give the desired freeze protection. See Charts B and C. These charts will also appear on the drums of antifreeze. A minimum of 30% Caterpillar antifreeze is required at the initial fill to give protection against cylinder liner and block pitting. Do NOT add any precharge, maintenance element, or liquid inhibitor at the initial fill.... AFTER 250 SMH (Service Meter Hours) or 20,000 km (12,500 mi), use either the maintenance element or a liquid inhibitor as recommended in the engine maintenance publication. DO NOT use both.... Keep the corrosion inhibitor at the correct concentration by following the cooling system conditioner recommendations in the current maintenance publication. OR, test the coolant for nitrites by using the 8T5296 Coolant Conditioner Test Kit. See first Reference Article on this subject.