Nissan coolant is extended life...if it's low in the reservoir-test it with a refractometer/coolant tester.
A 50/50 mixture should be -34*F
The higher the % of antifreeze,the lower the freeze point;but lessen's the cooling effectiveness.
Not sure your milage/but should be good for a minimum 5yrs./100k....also,if you top off w/water....use distilled water (bottled drinking water)
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