BMW 645Ci Engine – The Complete Guide

BMW 645ci engine

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

The car is equipped with rear-wheel drive as standard and a 6-speed manual transmission. The car has impeccable handling and is a real car for a road trip. The tire size of the car is 245/45 on 18-inch rims on the front wheel and the same size on the rear wheel. The BMW 645Ci was introduced to the market in 2003 by the BMW company. This sedan has two doors.

BMW 645Ci Engine Specifications

The BMW 645Ci can hit 60mph from zero in about 5.6 seconds. The car is known for its luxury, comfort, and stability. It runs like a cushion on bumpy roads and is the dream car of many people. Its key and interactive technological features make the car feel like a luxury hotel. It makes the car more interesting and knows its power and performance. So here are some engine specs of the BMW 645Ci engine.

Engine variant = gasoline

Teleport = 4.395CC

Maximum power = 328 hp at 5,500 rpm

Maximum torque = 600NM at 2000 to 4500 rpm

Number of valves = four

Total number of cylinders = eight

Reader type = TA

Gearbox = Automatic transmission

Fuel system = direct injection

Fuel capacity = 70 liters

Mileage = 7.94 (ARAI)

Top speed = 250km/h

Fuel Economy of the BMW 645Ci Engine

The complete guide about 645Ci complies with Euro 4 emissions standards and also has a fuel tank capacity of 70 liters. The fuel consumption of the engine in the city is 17.2 liters / 100 km. In addition, its consumption on the highway is about 8.6 liters / 100 km. The engine has a combined fuel consumption of 11.7 liters per 100 km. These characteristics are consistent with official data provided by the company. However, the estimated fuel consumption of the car in real situations is about 19.7 liters / 100 km. That’s 62% more than the company claims in its official figures. These vary widely as companies test their vehicles in the lab, and some real-world scenarios are overlooked during testing.

Problems with the Engine BMW 645 Ci

Still, the BMW is a reliable and comfortable car. In addition, the fuel consumption of the 645Ci seems to be very efficient. The car’s engine, even after running less than 1000 miles on the clock, still feels tight. However, the 645Ci also has some of its drawbacks, shown below.

1- Engine and Cooling System Problem

The car sometimes cuts continuously and then stops in the middle of the road. Also, the vehicle’s sensor alerts go off and on for no good reason. But even after servicing the car, the problem was not found. It is a common problem with electrical systems that the wrong information is displayed on the control panel.

2- The Maintenance Engine Light has a Problem

When you are driving a BMW on the road, it may show you messages about transmission-related problems. The other LEDs may also light up, indicating other errors. Sometimes the car slows down in the middle of the lane and stops. Even the mechanic sometimes can’t figure out the real problem of the car. It can also let you fix things that aren’t really relevant. All of this information is based on the driver’s experience.

3- The Car is Stalled

It is a common problem that the engine stalls in the middle of the highway. But even after trying to start the engine several times, the engine may still not start. Also, after resetting the car’s computer or system, sometimes it doesn’t work. Therefore, the owner has to go through great stress to get rid of these defects if they occur.


The BMW 645Ci hit the market in its original form in 2003. It was a two-door luxury car with a lot of technology inside. Moreover, the car weighs about 1590 kg with a trunk volume of 375 liters. It has a displacement of around 4395CC and can produce 328bhp with a peak torque of 600NM. The car is equipped with rear-wheel drive as standard and a 6-speed manual transmission.