I would include up to about a pint or so of distilled water.. anymore and i would pick up some coolant to mix. if it goes off once more, deliver it to your vendor. its possible just evap loss of the drinking water part of the coolant combine. glycol doesnt https://knoxvkwiu.bloguerosa.com/26847824/considerations-to-know-about-types-of-coolant-for-bmw-335i