Universal Coolant Top Up is ready to use and can be mixed with all coolant and inhibitor types including those that contain ethylene glycol and long life, low depletion rate inhibitors. It is specially designed not to discolour existing coolant* Universal Coolant Top Up is suitable for the cooling systems of all types of passenger vehicles, 4WD's, light & heavy commercial vehicles, stationary engines and motorcycles. It can be used to top up both Organic Acid Technology (OAT) & Hybrid Type A anti-freeze/anti boil coolants as well as Type B inhibitor only solutions. It is safe to use wherever anti-freeze / anti-boil / anti-corrosion properties are required and with all fuel types such as petrol, LPG, dual fuel, light & heavy duty diesel. Universal Coolant Top Up is yellow and will not discolour existing coolant if not mixed at greater than 10% of system capacity. There is no limitation on the amount of Universal Coolant Top Up used in the cooling system and it can be mixed with all coolant types regardless of colour. It is pre-diluted at a 50% concentration with demineralised water making the product ready to use right out of the bottle.