Cooling System 51 Extended Life Coolant Change Interval Replace coolant every 600,000 miles (960,000 km), 12,000 hours or every four years, whichever comes first. CAUTION Extended life coolant will test as out of additives (SCA), but SCA should not be added. Shortened engine life may be the result of adding SCA. A one-time extender package must be added to the cooling system after 300,000 miles (480,000 km), 6,000 hours or two years, whichever comes first. Note: DO NOT add supplement coolant additives (SCA) to extended life coolant.
Should the system become contaminated with regular coolant exceeding 10% of the system’s total capacity or if SCA is added to the system, either drain the system and refill with new extended life coolant or maintain the system as for regular coolant. Continue treating with SCA and change the coolant at the intervals recommended for regular coolant. Coolant Filter DO NOT use a filter that contains SCA. Instead use a bypass canister or “empty” filter. Replace the “empty” filter every 125,000 miles (200,000 km) or 2,500 hrs or 12 months, whichever comes first, to prevent external rust damage to the filter walls. WARNING Hot engine. Keep yourself clear of all hot engine parts and/or fluids.
A hot engine and/or fluids can cause serious burns.