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Go oem. It's not the same starter that came with the 325. All the new 328s have it. Much higher torque and rpm. The old ones had an issue in cold weather damaging the bendix bearing. It would get dry and would not allow the starter to spin or extend to the flywheel properly. You might have also noticed some grinding too. The new starters have no issues. Your issue is common with 325/330 from the '06 vintage, but only in cold weather (by cold I mean 40 or below). When mine died it smelled like burning death... Lol
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--Marcelo
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here! | Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors |