Check the listing for details. Pentosin 8115213 Pentofrost A1 Prediluted Engine Coolant. Condition: New. Listed at 22.03 USD. Pentofrost™ A1 Prediluted Engine Coolant (8115213) by Pentosin®. Volume: 1 Gallon. Type: HOAT. Color: Red. Long-Life. Pentofrost A1 is a phosphated organic acid technology (phosphated OAT); which is categorized as HOAT (hybrid organic acid technology) in the US market. Pentofrost A1 is suitable for all Asian vehicles using “red” Antifreeze/Coolant. Pentofrost A1 does not contain any silicate, borate, nitrite, or amine additives since these may harm your Asian vehicle. Do not mix with other coolants (especially silicated coolants), as this may cause gel formation and clog your radiator. Pentofrost A1 is a PREDILUTED antifreeze for Asian vehicle applications in water-cooled engines. It contains phosphates and organic salts to protect all materials used in cooling systems for Asian vehicles.