2005 Nissan 350Z Owner's Manual - Page 213

ENGINE COOLING SYSTEM The engine cooling system is filled at the factory with a high-quality, year-round, anti-freeze coolant solution. The anti-freeze solution contains rust and corrosion inhibitors, therefore additional cooling system additives are not necessary. Outside temperature down to °C −35 °F −30 50% Demineralized water/ distilled water 50% Antifreeze WARNING ¼ Never remove the radiator cap when the engine is hot. Wait until the engine and radiator cool down. Serious burns could be caused by high pressure fluid escaping from the radiator. ¼ See "If your vehicle overheats" in the "6. In case of emergency" section of this manual. ¼ The radiator is equipped with a pressure type radiator cap. To prevent engine damage, use only a genuine NISSAN radiator cap. CAUTION When adding or replacing coolant, be sure to use only a Genuine NISSAN Long Life Antifreeze/Coolant (green) or equivalent with the proper mixture ratio of 50% anti-freeze and 50% demineralized water/distilled water. The use of other types of coolant solutions may damage your engine cooling system. SDI1445 CHECKING ENGINE COOLANT LEVEL Check the coolant level in the reservoir tank when the engine is cold. If the coolant level is below MIN, add coolant up to the MAX level. If the reservoir tank is empty, check the coolant level in the radiator when the engine is cold. If there is insufficient coolant in the radiator, fill the radiator with coolant up to the filler opening and also add it to the reservoir tank up to the MAX level. If the engine cooling system frequently requires coolant, have it checked by a NISSAN dealer. 8-8 Maintenance and do-it-yourself