This situation is a relatively new one into the B48 Local community and revolves all-around a recall over the B48 motor. BMW issued a technological provider bulletin in April of 2022 outlining a probably major problem having a coolant ventilation line around the cylinder head of many US-spec B48 engines. https://knoxxmzly.blogchaat.com/29395195/the-2-minute-rule-for-motor-custom-bobber