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Hi, I have a 96 CE110 and its time to refill the radiator coolant. Here are my problems 1. I currently use a regular green color coolant and was thinking about using toyota/caltex red coolant but read in some places that you should not use the newer organic acid coolants in iron block engines and brass radiators. What do you guys say about this ? 2. Do I need to drain the old coolant from the engine block too ? Is it not enough to drain it from the radiator only. and how hard is it to drain the coolant via the engine block drain in a 2c engine ? 3. Do I need to do a coolant flush from a place like pitstop. Is it really worth it? How many of you do it ? My current coolant has been there for almost 30k km now and it does not have the green color anymore Also as I remember it was a local brand. (Not sure though). The engine is almost on the 200,000km mark now. Thanks.