I fitted the Forge replacement one after 2 sets of seals had been fitted on the OEM on in 12 months. Not a leak since and its been on at least 2 years now
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M240i LCI (Mineral Grey):- M2 Door Mirrors, M2 Black Kidney Grills, Lower grille inserts, MP Exhaust, Dinan Carbon Fibre CAI, hot climate intake elbow