What's the difference between BMW 3 Series, BMW 5 Series and BMW 7 Series? Is M3 M5 M7 the same as Series 3, Series 5 and Series 7?

BMW has no M7, only B7. Hehe, M3, M5, M6 and M6 are all the same size as the original car, that is, the 3 series, 5 series and 6 series you mentioned. Of course, I want to explain here that the size of the series is different from the current 5 series in China, because the 5 series released in China is Li, which is an extended version, and the 5 series released abroad is a short-axis version.

In addition, as you said, except the engine, the tuning gearbox of the suspension system of the whole vehicle is different. M series all use SMG gearbox, and ordinary models use BMW's ordinary gearbox.

Another difference is the details of the car. For example, M-series wheels are unique to M-series, as well as rearview mirrors, small tails and other small things. The interior of M-series can be customized, such as carbon fiber interior.

Ask again if you have any questions:)