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      08-01-2019, 08:48 AM   #7
aerobod
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Quote:
Originally Posted by MiamiM235iEstorilBlue View Post
never heard of mixing 50/50. Is that normal practice? Is it a Bad idea to just refill with 100% BMW coolant?
Many coolants from parts stores are already pre-mixed 50/50 with water, it should say on the bottle. BMW coolant from the BMW parts dept is not generally pre-mixed.

It is a very bad idea to fill with 100% coolant as the engine will likely overheat due to poor heat transfer in typical summer conditions and in very cold conditions the coolant will freeze sooner than a 50/50 mix with distilled water.
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