BMW M47 and M57 coolant flange O-rings are a well-known weak spot, as they harden, wear out, and eventually leak – especially if you disconnect the hoses after years of use and try to reuse the old seals. The biggest issue? Neither BMW nor aftermarket brands offer replacements, and there’s no official part number either, making them very difficult to find. They must be matched precisely by size and thickness. If you’re planning to replace your coolant flange or disconnect the hoses, we highly recommend grabbing a set of these O-rings. They’ll likely save you a major headache down the line. Fits all M47 and M57 engines (all revisions) from 1998 to 2012, including M47, M47N, M47N2 (M47TU2), M57, M57N, and M57N2 (M57TU2). Buy More & Save! Quantity Price / Set Discount 0-1 Sets €8.00 0% 2-4 Sets €6.80 15% 5-9 Sets €6.00 25% 10 Sets €5.20 35% Note: One set includes two O-rings – one for the larger and one for the smaller hoses.