They probably didn't flush it fully, but when you replace the water pump about half of the coolant is drained, so half of it is new!
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2001 e36/7 M Roadster 5spd
2008 e90 335i 6spd
2011 e90 335xi 6spd
2011 e70 x5 diesel
2010 Ducati Monster 696
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