BMW 645Ci Engine

BMW 645Ci Engine- Complete Guide

The BMW 645Ci engine has a fuel economy rate of 11.7liters per 100 kilometers. That is 24mpg in the UK and 20mpg in the US. The car can reach a speed of 60mph from zero in just about 5.6 seconds. It can also reach a maximum speed of 155mph or 250km/hour. The BMW 645Ci has a weight of about 3505lb or 1590kg. The car comes with a powerful naturally aspirated V8 petrol engine. The car is capable of generating a power of 328bhp or 245KW. It can also achieve a maximum possible torque speed of 450 NM or 331lb-ft. 

The car comes standard with a rear-wheel drive and has a six-speed manual gearbox. The car has perfect handling and is a genuine car for a road trip. The tire size of the car is 245/45 on the 18inch rims at the front and has the same size at the rear wheel. The BMW 645Ci was introduced in the market in 2003 by the BMW company. This sedan has two doors.

Table of content-

  • Engine specification of BMW 645Ci
  • The fuel efficiency of the BMW 645Ci engine
  • Problems with the BMW 645 Ci engine
  • Conclusion

Engine specification of BMW 645Ci-

The BMW 645Ci can reach a speed of 60mph from zero in about 5.6 seconds. The car is known for its luxury, comfort, and stability. It drives like a cushion in a bumpy road and is a dream car for many individuals. It’s important and interactive technological features make the car feel like a luxury hotel. This makes the car more interesting and knowing about its power as well performance. So below are some of the specifications about the engine of the BMW 645Ci engine.

  • Engine variant = petrol
  • Displacement = 4,395CC
  • Maximum Output = 328bhp with an rpm rate of 5,500
  • Maximum Torque = 600NM with an rpm rate of 2000 to 4500
  • No of Valves = four
  • Total no of cylinder = eight
  • Drive type = FWD
  • Transmission = Automatic transmission
  • Fuel transferring system = Direct injection
  • Fuel storing capacity = 70 liters
  • Mileage = 7.94(ARAI)
  • Maximum speed = 250km/hour

Fuel efficiency of BMW 645Ci engine-

The 645Ci follows an emission standard of Euro 4 and also has a fuel tank storage capacity of 70 liters. The fuel consumption of the engine in the city is 17.2liters/100km. Also, its fuel consumption on the highway is about 8.6 liters/100km. The engine has a combined fuel consumption rate of 11.7liters/100km. These features are according to the official data provided by the company. However, the estimated fuel consumption of the vehicle in real-world situations is about 19.7liters/100km. It’s 62 percent more than what the company claims in its official figures. These are so different because companies test their vehicles in the lab and there are some real-world situations that are neglected in the test. 

Problems with the BMW 645 Ci engine-  

However, the BMW is a reliable and comfortable car. Also, the fuel consumption of the 645Ci seems to be very efficient. The car engine even after driving less than 1000 miles on the clock feels tight. However, the 645Ci also comes with some of its disadvantages that are shown below. 

1- Engine and cooling system problem 

The car sometimes continuously cuts off and stops in the middle of the road. Also, the sensor alert of the car goes off and on without any big reason. But even after servicing the car, the problem does not come to be found. There is a common problem with the electrical system of showing the wrong information on the dashboard.

2- Service engine light problem 

While driving a BMW on the road it may display you a message of transmission-related problems. After which other lights may also light up showing some other errors. Also sometimes the car decreases its speed in the middle of the lane and stops. Even the mechanic sometimes can’t find the real problem with the car. It can also lend you to repairing the things that are not really relevant. All this information is according to the driver’s experience. 

3- Car stalling problem

There is a common problem with the engine being stalled in the middle of the highway. But even after trying to start the engine several times, the engine may not start. Also, after resetting the computer or system of the car it sometimes does not work. So the owner has to go through big stress on clearing these faults if they occur. 


The BMW 645Ci first came into the market in its original form in 2003. It’s a two-door luxury car with a lot of technology inside. Also, the car weighs about 1590kg with a boot space of 375 liters. It has an engine size of about 4395CC and can generate a power of 328bhp with a maximum torque rate of 600NM. The car comes standard with a rear-wheel drive and has a six-speed manual gearbox. 

Leave a Reply

Your email address will not be published.