You may not have come acrosss Prestone - it is marketed as a superior spec coolant that is cleverly engineered so that it can be added to any car, any cooling system, any colour of existing coolant. Not bad for 4 litres. They do a cheap 1 litre pack, too. Typically £23-25 elsewhere. Don't compare to bog standard coolants as this is better quality.
Prevents overheating during the summer, and avoids freezing during the winter Can be used in ANY Passenger vehicle (Petrol or Diesel)
Can be mixed with ANY existing colour antifreeze
5 Year guarantee
Prestone Antifreeze is a high quality, universal coolant suitable for varius vehicles, cooling systems and can even mix with all existing antifreeze. The Ready to use mixture can be poured straight into an empty, or part filled system.