What is the grinding noise when I start my M3 in cold weather?
A. The noise is most likely a delayed actuation of the starter gear causing it to remain in partial mesh and consequently grind with the ring gear for a longer period than normal. This problem is exacerbated in cold weather and is often solved by replacing the starter provided the dealer can confirm the noise. If replacement of the starter is not possible, simply release the key sooner on startup, perhaps after one or two engine revolutions.
