Opticool Antifreeze P-OAT is a monothylene glycol based antifreeze and is recommended for use in new model Asian automotive vehicles and light duty trucks requiring a phosphate-based OAT engine coolant. This long life product protects the coolant system metals using corrosion inhibitor technology that is free from silicates, borates, nitrites and amines. Phosphate is a key component along with organic additives that provide excellent protection at high temperatures, especially to aluminium.