the manual says civics need the Honda Antifreez Type 2, but I'm just wondering would the brand name at supermarkets just be as ok for my 2004 civic ex/si?? Or must I drive down to the dealer and buy the genuine Honda coolant and pay the premium for that?

Thanks

 

some say otherwise, but I don't bother with Honda branded coolant. I just buy brand name stuff, and change it pretty regularly

 

I just used Prestone 50/50 from the auto parts store. The only OEM Honda fluid I strictly adhere to is the transmission fluid.

 

+1 No need for Honda coolant, or oil either.

 

In the summer, I use distilled water, with DEI Radiator relief. When it gets a little colder out, I will just toss Honda Coolant in.