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Difference Between BMW 650i and 645i

BMW 650i vs 645i

The 645i and 650i are two high-performance cars of BMW that belong to the 6-series. They are both well known for their large engines, elegant styling, and wallet-eating price tags. The main difference between the 650i and the 645i is their age. The 645i is an older model that was made in 2004 and 2005 while the 650i started production in 2006 and continues up to the 2012 model released this year. As expected, the many revisions of the 650i mean that it has improved its features over the years.

The single aspect that buyers would probably look into is the power of the engine. The 645i has a 4.4 liter engine that is capable of putting out around 333hp. The 650i started out with a bigger 4.8 liter engine that was able to put out a correspondingly higher 360hp. But with the latest model, BMW managed to decrease the engine displacement to just 4.4 liters while increasing the power output to 400hp.

Gearbox options for the two are also different. The 645i is available with either a manual transmission or an automatic transmission. The 650i has purely been a 6-speed manual transmission. So those who do not know how to drive a stick need not apply for the 650i.

Lastly, BMW introduced Brake Energy Regeneration technology with the 650i; something that is not present in the 645i. This is similar to what an electric vehicle uses to recover some energy and recharge its battery. The concept is still the same with the 650i. It recovers some of the car’s kinetic energy, converts it to electricity, and uses that electricity to charge the battery. Once the battery is fully charged, the 650i is able to disengage the generator. In normal driving, this translates to less engine strain and reduced fuel consumption. But when you want to drive aggressively and push your vehicle to the limit, this translates to more power to the wheels for increased acceleration.

All in all, without concern for the price, the 650i is the better vehicle between the two. It is more powerful, more fuel efficient, and the better looking between the two.


1.The 650i is a new model compared to the 645i.
2.The 650i has a more powerful engine than the 645i.
3.The 645i comes in manual and automatic transmissions while the 650i only comes in manual.
4.The 650i is equipped with Brake Energy Regeneration technology while the 645i isn’t.

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  1. BMW 650 comes also in automatic gearbox!

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