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Ditto - for my 2010 Prius at 300,000km!
I'm getting the feeling there is a head gasket leak issue with GEN III Prius's - I went through all the symptoms you describe and all the typical...
Tankyuong - you've got it right! That was my issue with 2010 Prius - unfortunately found out too late - end up with warped engine block.
Tankyuong, in a previous reply, likely has it right - could be a warped engine block and/or head gasket leak allowing small amount of coolant into...