In my experience it won't matter. I normally check our coolant at room
temperature and the OEM recommends a ratio of 3-5 percent for our
coolant type. Being off by a percentage or so in most cases isn't
going to be significant for any concerns. Of course there are some
that have radical machining conditions where the daily volume of
coolant and temperature rapidly changes and therefore could be more of
a concern. Anyway, always follow what is documented from the OEM is my
best recommendation for you in normal conditions.
Hope this helps.
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