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I just recently had to add about 2 cups. Hadn't checked since back in May when I replaced the exploded coolant tank. I believe that temperature change can have a slight impact on fluid level over time as well. It was in the 70s when I last filled and bleed the system. Now it is in the 30s-40s so I wasn't too concerned about the lower level. Both my ZHP (M54) and X3 (N52) also have to be topped off about twice a year.
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