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Brian, the W/W fluid does evaporate some and does so depending on a few conditions like high heat/low humidity and changes in temperature during seasonal changes. If the light comes on, try adding 16oz of fluid (your choice). If it goes out, add some more until your happy the bottle is full. One note, when the bottle is full it'll leak out of the overflow hose inside the fender well. It will not flow to the top of the bottle UNLESS that overflow is plugged and cannot drain the excess. Hope it is just low and not a leak, time will tell.


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