G643 (E) Service Manual Chapter 3. Engine Mechanical System 56
Make proper antifreeze additions.
Adding pure antifreeze as a makeup solution for
cooling system top-up is an unacceptable practice. It
increases the concentration of antifreeze in the
cooling system which increases the concentration of
dissolved solids and undissolved chemical inhibitors
in the cooling system. Add antifreeze mixed with
water to the same freeze protection as your cooling
system.
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