BMW 528 B48 Coolant Loss: Oil Filter Housing and Pipe Connector Repair
A BMW 528 with a B48 engine and 130,000 km repeatedly requested coolant but left no obvious puddle. Pressure loss and dried coolant traces led beneath the intake area to two confirmed leak points: the oil-filter-housing interface and a cracked cylinder-block coolant-pipe connector. Both were repaired before vacuum filling, bleeding, a 20 km road test, and a dry recheck; the page/video model-year conflict is disclosed rather than resolved by guesswork.