Does Nissan not do level sensors? I thought they were pretty common now but may be wrong.
Mark me as one who makes my own. For me its more economical during the summer, winter I need to figure out using store bought alcohol as its expensive with my current mix. Mixing your own avoids the trip to the store and a gallon jug to dispose of, not to mention its much better fluid than the cheaper store bought fluids. I have an undersink reverse osmosis system so the water I use to make my own is quite pure.
Summer -
$1.64/gallon.
Winter -
$5.14/gallon. (Mix summer concentrate for washing performance with the winter for antifreeze).
Winter w/out summer concentrate -
$3.50/gallon. Good for down to high teens freezing point.
Nextzett Kristall Klar concentrate (summer)
VW/Audi genuine winter fluid
The Nextzett summer concentrate is fabulous. Nice soapy texture that washes beautifully and because its a bit more viscous it does not continually run down the windshield after you finish washing.