I'm from South Africa and have 2 Toyotas - a 1986 HiLux 4x4 double cab and now also a 1 month old Prius. Here are some relevant comments:
Both the vehicles handbooks recommend coolant change after about 2 years in use. Note - NOT distance related. I also have on my home dwelling a roof mounted indirect hot water solar heater system, and they also recommend changing the yellow/green anti freeze every 2 years - they say it becomes acidic and hence damaging after long use.
Chatting to Castrol technical people here I learned Toyota Red is possibly the only coolant with a phosphate additive. So it is incompatible with any of the more common yellow/green types.
None of my current vehicles nor previously owned ones [3 Audi saloon models since 1989] or the others in my family [ Wife's - Renault Clio and previously Opel Corsa, Opel Monza, Opel Kadette & Daihatsu Charade] have ever needed topping up of coolant. All had overflow/recovery systems. Temperatures here can exceed 40'C/104'F and when I've been in the remote parts of our subcontinent [Namibia, Botswana & Angola] in my 4x4 where it has been even hotter and the engine working harder than any city car would ever do - I have never had to top it up.
Re the two types of coolant: This hits a raw spot - this is a current message to a Toyota dealership I await a reply to:
** Please ask your parts person, Dennis - from whom I got my HiLux 4x4 spares last week Friday [Invoice 90260M], to comment: When I last bought [in
2002] Toyota Long Life Coolant - it was part # A08889-0GLLC and was concentrated and one diluted it to suit the lowest temperature needed. Cost about R30/litre. For use I bought 3 litres and diluted with 4 litres water. Total cost about R90. Now Dennis has sold me Toyota Super Long Life Coolant part number 08889-80089 costs R23.21 /litre and it is pre-diluted 50% so I need 7 litres which costs me R172.50. Something is wrong! Please ask him to call me and discuss if I can get the older coolant.
Hope this assists. Peter