Over the last 10+ years, engine coolants have become very specialized. AND in some cases if you add the wrong type/technology it can turn to a gel.
Even when you drain all the coolant out, there is still about a quart inside the engine block. (unless you remove the "impossible to get at with the engine in the car" block drain plugs.)
Whatever you decide to do, make sure it is compatible with the Nissan stuff.
The "Penrite Green OEM Coolant" in the second post didn't list Nissan as OEM approved.
Much like the others here, I just use the Nissan stuff and I don't need to worry about it being compatible.
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