E90 cooing systems are fairly decent even with the plastic bits..no where near bad as the E46..Just be glad you dont own a F3x..Plastic Oil pan (RWD), plastic trans cooler lines, plastic trans cooler assembly, plastic oil filter housing assembly, overly complicated high and low coolant circuits on the B series engines with 4 radiators. Remember a few years back, BMW thought a plastic oil filter housing on the N2x was a wise decision. With BMW its always two steps forward, three steps back IMO
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