Part of a massive in-depth guide to the new M3 and M4 models, the guys from BMW released a new interview with one of the key people involved in the development of those cars, Mr. Bernd Jacob. He was ...

My BMW i3’s rear differential has been a gigantic pain in the butt in that — thanks to a Technical Cost Reduction by BMW after the first model-year — it no longer features a fill plug. How, then, am I ...

Pinion shaft provides a permanent gear reduction between the engine and the driving road-wheels. In vehicles, the differential is the main part which transmits the movement coming from the engine to ...