Its my first time using idsi engine and i want to know what kind of coolant to use in my GD1 2007 honda fit. Any advice guys?i have just acquired it recently and i have no idea on which coolant to use. by the way, i leave in a tropical country if it helps. Thanks in advance.

 

If you can find HOAT type coolant, use that. OAT coolant is also pretty good.
And don't mix coolants - use one type and stick with it.