Thank you AM and Crystalworks! That’s very good tip!

I drained out over 6 quarts of that light orange liquid and refilled with roughly the same quantity of Bmw antifreeze.

The thing is, I poured it straight without any dilution.

Is this a bad idea?

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2003 X5 4.6is Estoril Blue, acquired March 2018
2013 128i M Sport 6 MT Space Grey daily driver
2010 535xi 6 MT Barbera Red