I might increase around a few pint or so of distilled water.. any more and I'd get some coolant to mix. if it goes off once more, carry it on the supplier. its probable just evap loss of the h2o portion of the coolant combine. glycol doesnt evap as quickly https://auto-collision-repair-bou62504.link4blogs.com/49447100/5-easy-facts-about-types-of-coolant-for-bmw-335i-described