mikec03 Posted July 28, 2019 Share Posted July 28, 2019 What be the problem with switching from the old green coolant which has the silicate/ phosphate etc to the newer acid based coolants, such as amsoil poly organic acid technology. The car is over 20 years old. Of course I would clean out the old coolant. I just wonder if anyone actually has done this. Of course, the mgfs say that the new coolant is compatible, etc. Link to comment Share on other sites More sharing options...
mikec03 Posted July 29, 2019 Author Share Posted July 29, 2019 Bump. Surely someone has put the newer organic acid based antifreeze in their old subaru. I'm worried that it will peal off the scale and plug up the heater/radiator.. Link to comment Share on other sites More sharing options...
heartless Posted July 30, 2019 Share Posted July 30, 2019 nope, sorry, have not & don't see a need to. The car does not call for it, so why would I go to the added expense of something that could potentially cause harm? Link to comment Share on other sites More sharing options...
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