Coolant

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The Radiator Coolant keeps the engine from overheating, and prevent it from freezing. So it is also known as anti-freeze (antifreeze). Straight water can be used, but is subject to rust and to freezing, and non-distilled water can cause particle build up in the cooling system.

Fill the radiator with a distilled water in a 50/50 mix of coolant/antifreeze. If you live in freezing areas, check the coolant container for instructions (which may require a 30/70 mix in very cold areas).

Specifications

Antifreeze/Coolant for radiator

Recommended:

• Producing: Antifreeze coolant L.L.C. (Nissan "Long Life Coolant")
• Shell Shellzone

Acceptable:

• Chevron Atlas Perma Guard antifreeze
• ESSO Long Life Coolant
• ESSO Atlas Long Life Coolant RAD
• Mobile Permazone
• Sunoco Permanent Type
• Texaco Antifreeze Coolant
• Texaco Startex Antifreeze Coolant

Comments: Many of these brand are no longer available. Any modern antifreeze/coolant that is compatible with aluminum parts should be acceptable. The Datsun 1200 uses an aluminum head and water pump.