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2004
BMW 645

Starts at:
$69,300
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New 2004 BMW 645
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NHTSA tested vehicle score
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Available trims

See the differences side-by-side to compare trims.
  • 645Ci 2dr Cpe
    Starts at
    $69,300
    18 City / 26 Hwy
    MPG
    4
    Seat capacity
    Gas V8
    Engine
    Rear Wheel Drive
    Drivetrain
    See all specs
  • 645Ci 2dr Convertible
    Starts at
    $76,300
    18 City / 26 Hwy
    MPG
    4
    Seat capacity
    Gas V8
    Engine
    Rear Wheel Drive
    Drivetrain
    See all specs

Notable features

Manual, automatic or Sequential Manual Gearbox (SMG)
325-hp V-8
Lightweight construction
Dynamic Driving Control
Run-flat 18- or 19-inch tires

The good & the bad

The good

Stylish appearance
Heritage
Performance, especially with the manual gearbox
RWD handling and stability
Power glass rear window in the convertible

The bad

Minimal backseat space
SMG operation in automatic mode
Jittery ride at times
Fuel economy
Price

Expert 2004 BMW 645 review

our expert's take
Our expert's take
By
Full article
our expert's take

Surrender Without Shame
2004 BMW 645Ci Convertible

Winter had broken its truce with spring, sending in cold winds and chilled rain. The top was not coming down on the 2004 BMW 645Ci convertible in that climatic betrayal. I was not disappointed.

My spirits remained aloft with the cloth roof. That is the power of this car, also available as a hardtop coupe. It is motorized Valium. Rain or shine, soft top or hard, it brings smiles to the tightest faces, parts the stiffest lips.

It is a matter of letting go, yielding to the machine. In this case, there is joy in surrender.

The 645Ci convertible is no ordinary car. It isn’t practical, nor is it politically correct. It is not ashamed of the wealth required to own it. It is hedonistic in the extreme.

No one needs a $77,000 car. But what is virtue without sin? What is sin without temptation, seduction? The road to perdition can be a marvelous romp, and a damned fast one, too. The convertible, equipped with a six-speed manual transmission, moves from 0 to 60 mph in six seconds. The coupe, similarly equipped, does it in 5.5.

But where can you drive in this manner, and enjoy all that is promised by the 645Ci’s 325-horsepower, 32-valve, 4.4-liter V-8 engine?

There are certain legal dens of iniquity. My favorites in the mid-Atlantic region include Summit Point Raceway in Summit Point, W.Va. (www.bsr-inc.com). It is 70 miles from the District of Columbia’s automotive prudery, deep within the Shenandoah Valley. Another is the Virginia International Raceway (www.virclub.com) in Alton, Va., about a one-hour drive from Raleigh, N.C.

Out West, there is the Infineon Raceway (www.infineonraceway.com) in Sonoma, Calif.

All of those tracks are open to car clubs and civilian car nuts, usually for a fee. All cater to weekend warriors. All have sanctioned track events and driver-training courses. There are rules to be followed, of course. But the regulations, such as helmet requirements, are in place to ensure fun rather than to restrict it.

There is something wonderfully liberating, exhilarating, about driving a car such as the 645Ci convertible at speed without looking over your shoulder in fear of flashing lights. There is a sense of risk, willingly taken in pursuit of one mile per hour faster than you’ve ever gone before.

At the end, if all goes well, there is a giddy flush, a feeling of accomplishment tempered only by the desire to go even faster the next time out. Can you do it? Can your car? You wonder.

Sometimes, after failure, if you’re lucky, you pout about damage done to your car by going off-track. If you are truly unlucky, you don’t pout at all. Your family mourns.

Yes, this is crazy. But the millions of us infected by this insanity see logic, order, even nobility in the practice. It matters not that ours is a rationalization of lust.

What mat ters is the speed of it all, the elegant balance, for example, of the 645Ci convertible moving nimbly around a track at the limits of traction. This rear-wheel-drive car does it so well. Handling is enhanced by super-rigid body construction. Not even the cowl, the section of the car body that supports the instrument panel and climate-control system, shakes at high speeds. Even with its fully lined cloth roof up — and cloth is a natural ally of air resistance — the car whispers through the wind.

Bumps and other unpleasantness are absorbed through well-calibrated suspensions front and rear. They are strong, yet lightweight components employing lots of aluminum at both ends. The effect is to reduce unsprung weight — the weight of car parts not supported by springs — and render the car less vulnerable to the tortures and deceptions of irregular road surfaces.

As you might expect, there are amenities aplenty in the 645Ci coupe and convertible, which share many fea ures with BMW’s 5-Series and 7-Series cars. I could live without some of those items, especially the computerized iDrive system, which controls functions such as onboard navigation, climate control, entertainment and communications.

I-Drive in the 645Ci is less of an overcomplicated nuisance than it was in previous BMW models. But it remains a nuisance nonetheless. I gladly would trade it for days of bright sunshine, blue skies, mild temperatures and cooperative winds.

I’d push the button to drop the top on such a day, and happily speed off into the distance.

Nuts & Bolts

Downside: The iDrive system should be dumped. Period. As I’ve said before, BMW needs to swallow its pride and buy Honda’s navigation/infotainment/communications system, which is much more intelligent than anything BMW has come up with lately.

Ride, acceleration and handling: Triple aces. But keep in mind that the six-speed manual gearbox is barely tolerant of first gear. This car wants to run. I often started the thing in second.

Head-turning quotient: The 645Ci convertible, with its exaggerated, flippant rear end, snapped necks everywhere. There have been many complaints about BMW’s radical new styling direction. I am not among the critics. The old BMW design was stodgy, boring, several short steps above the Toyota Camry. BMW should continue moving in a new styling direction.

Body style/layout: Front-engine, rear-wheel drive, four-seat convertible with power-operated roof.

Engine/transmission: One engine. It’s the 4.4-liter, 32-valve, V-8 that develops 325 horsepower at 6,100 revolutions per minute and 330 foot-pounds of torque at 3,600 rpm. There are three transmissions — a six-speed manual; a six-speed Steptronic automatic that can be operated as a manual shifter; and a sequential manual gearbox (SMG), which is an electronically controlled version of the six-speed manual.

Cargo and fuel capacities: Luggage capacity is 12.4 cubic feet. The fuel tank holds 18.5 gallons of required premium unleaded gasoline.

Mileage: Not great. Driven at posted highway speeds with the top up, the 645Ci convertible gets about 23 miles per gallon — and less as speed increases.

Safety: Anti-lock brakes, side air bags, stability control, traction control and automatic pop-up roll bars are standard.

Price: Base price on the tested 2004 BMW 645Ci with six-speed manual is $76,300. Dealer invoice price on base model is $69,595. Price as tested is $84,590 including $7,595 in options and a $695 destination charge. Dealer’s price with options and destination charge is $77,200.

Purse-strings note: Great toy. Lots of competitors in the store, including the very competitive Cadillac XLR, Jaguar XK-Series, Mercedes-Benz SL-Class, 2004 Maserati Cambiocorsa Coupe and the Porsche 911. Competition means you can bargain . . . somewhat.

2004 BMW 645 review: Our expert's take
By

Surrender Without Shame
2004 BMW 645Ci Convertible

Winter had broken its truce with spring, sending in cold winds and chilled rain. The top was not coming down on the 2004 BMW 645Ci convertible in that climatic betrayal. I was not disappointed.

My spirits remained aloft with the cloth roof. That is the power of this car, also available as a hardtop coupe. It is motorized Valium. Rain or shine, soft top or hard, it brings smiles to the tightest faces, parts the stiffest lips.

It is a matter of letting go, yielding to the machine. In this case, there is joy in surrender.

The 645Ci convertible is no ordinary car. It isn’t practical, nor is it politically correct. It is not ashamed of the wealth required to own it. It is hedonistic in the extreme.

No one needs a $77,000 car. But what is virtue without sin? What is sin without temptation, seduction? The road to perdition can be a marvelous romp, and a damned fast one, too. The convertible, equipped with a six-speed manual transmission, moves from 0 to 60 mph in six seconds. The coupe, similarly equipped, does it in 5.5.

But where can you drive in this manner, and enjoy all that is promised by the 645Ci’s 325-horsepower, 32-valve, 4.4-liter V-8 engine?

There are certain legal dens of iniquity. My favorites in the mid-Atlantic region include Summit Point Raceway in Summit Point, W.Va. (www.bsr-inc.com). It is 70 miles from the District of Columbia’s automotive prudery, deep within the Shenandoah Valley. Another is the Virginia International Raceway (www.virclub.com) in Alton, Va., about a one-hour drive from Raleigh, N.C.

Out West, there is the Infineon Raceway (www.infineonraceway.com) in Sonoma, Calif.

All of those tracks are open to car clubs and civilian car nuts, usually for a fee. All cater to weekend warriors. All have sanctioned track events and driver-training courses. There are rules to be followed, of course. But the regulations, such as helmet requirements, are in place to ensure fun rather than to restrict it.

There is something wonderfully liberating, exhilarating, about driving a car such as the 645Ci convertible at speed without looking over your shoulder in fear of flashing lights. There is a sense of risk, willingly taken in pursuit of one mile per hour faster than you’ve ever gone before.

At the end, if all goes well, there is a giddy flush, a feeling of accomplishment tempered only by the desire to go even faster the next time out. Can you do it? Can your car? You wonder.

Sometimes, after failure, if you’re lucky, you pout about damage done to your car by going off-track. If you are truly unlucky, you don’t pout at all. Your family mourns.

Yes, this is crazy. But the millions of us infected by this insanity see logic, order, even nobility in the practice. It matters not that ours is a rationalization of lust.

What mat ters is the speed of it all, the elegant balance, for example, of the 645Ci convertible moving nimbly around a track at the limits of traction. This rear-wheel-drive car does it so well. Handling is enhanced by super-rigid body construction. Not even the cowl, the section of the car body that supports the instrument panel and climate-control system, shakes at high speeds. Even with its fully lined cloth roof up — and cloth is a natural ally of air resistance — the car whispers through the wind.

Bumps and other unpleasantness are absorbed through well-calibrated suspensions front and rear. They are strong, yet lightweight components employing lots of aluminum at both ends. The effect is to reduce unsprung weight — the weight of car parts not supported by springs — and render the car less vulnerable to the tortures and deceptions of irregular road surfaces.

As you might expect, there are amenities aplenty in the 645Ci coupe and convertible, which share many fea ures with BMW’s 5-Series and 7-Series cars. I could live without some of those items, especially the computerized iDrive system, which controls functions such as onboard navigation, climate control, entertainment and communications.

I-Drive in the 645Ci is less of an overcomplicated nuisance than it was in previous BMW models. But it remains a nuisance nonetheless. I gladly would trade it for days of bright sunshine, blue skies, mild temperatures and cooperative winds.

I’d push the button to drop the top on such a day, and happily speed off into the distance.

Nuts & Bolts

Downside: The iDrive system should be dumped. Period. As I’ve said before, BMW needs to swallow its pride and buy Honda’s navigation/infotainment/communications system, which is much more intelligent than anything BMW has come up with lately.

Ride, acceleration and handling: Triple aces. But keep in mind that the six-speed manual gearbox is barely tolerant of first gear. This car wants to run. I often started the thing in second.

Head-turning quotient: The 645Ci convertible, with its exaggerated, flippant rear end, snapped necks everywhere. There have been many complaints about BMW’s radical new styling direction. I am not among the critics. The old BMW design was stodgy, boring, several short steps above the Toyota Camry. BMW should continue moving in a new styling direction.

Body style/layout: Front-engine, rear-wheel drive, four-seat convertible with power-operated roof.

Engine/transmission: One engine. It’s the 4.4-liter, 32-valve, V-8 that develops 325 horsepower at 6,100 revolutions per minute and 330 foot-pounds of torque at 3,600 rpm. There are three transmissions — a six-speed manual; a six-speed Steptronic automatic that can be operated as a manual shifter; and a sequential manual gearbox (SMG), which is an electronically controlled version of the six-speed manual.

Cargo and fuel capacities: Luggage capacity is 12.4 cubic feet. The fuel tank holds 18.5 gallons of required premium unleaded gasoline.

Mileage: Not great. Driven at posted highway speeds with the top up, the 645Ci convertible gets about 23 miles per gallon — and less as speed increases.

Safety: Anti-lock brakes, side air bags, stability control, traction control and automatic pop-up roll bars are standard.

Price: Base price on the tested 2004 BMW 645Ci with six-speed manual is $76,300. Dealer invoice price on base model is $69,595. Price as tested is $84,590 including $7,595 in options and a $695 destination charge. Dealer’s price with options and destination charge is $77,200.

Purse-strings note: Great toy. Lots of competitors in the store, including the very competitive Cadillac XLR, Jaguar XK-Series, Mercedes-Benz SL-Class, 2004 Maserati Cambiocorsa Coupe and the Porsche 911. Competition means you can bargain . . . somewhat.

Factory warranties

New car program benefits

Basic
4 years / 50,000 miles
Corrosion
6 years
Powertrain
4 years / 50,000 miles
Roadside Assistance
4 years / 50,000 miles

Certified Pre-Owned program benefits

Age / mileage
Certified Pre-Owned Elite with less than 15,000 miles; Certified Pre-Owned with less than 60,000 miles
Basic
1 year / unlimited miles from expiration of 4-year / 50,000-mile new car warranty
Dealer certification
196-point inspection

Consumer reviews

4.6 / 5
Based on 21 reviews
Write a review
Comfort 4.5
Interior 4.5
Performance 4.7
Value 4.5
Exterior 4.7
Reliability 4.3

Most recent

  • 15 Bimmers and counting...at least that lol

    good comments all around, spent 7K for new plugs and coils, brakes, rear suspension, etc..on 54K car (2004)and was going to buy new--but, an extra car...worth it...new tires a few years ago and better than most on the road, enjoy
    • Purchased a New car
    • Used for Having fun
    • Does recommend this car
    Comfort 5.0
    Interior 5.0
    Performance 5.0
    Value 5.0
    Exterior 5.0
    Reliability 5.0
    2 people out of 2 found this review helpful. Did you?
    Yes No
  • 15 Bimmers and counting

    my 04 with 53K is a stud..about to upgrade brakes and suspension just bec of age...don't feel anything wrong..but deciding to keep vs new..her stable mate a 2022 M760..but still love her..would need to part with 200K for the same smile...looks brand new and always complements...20-25? before i upgrade?
    • Purchased a New car
    • Used for Having fun
    • Does recommend this car
    Comfort 5.0
    Interior 5.0
    Performance 5.0
    Value 5.0
    Exterior 5.0
    Reliability 5.0
    2 people out of 3 found this review helpful. Did you?
    Yes No
  • Beautiful car

    Bought my 2004 645Ci convertible with just over 41K miles just a month ago and haven’t stopped smiling. Handles like a small euro-spec cabriolet despite its size. Time will tell how reliable it is, but first owner clearly babied it with regular dealer services. Very comfortable standard seats and a fast V8 that could be scary fast to some. Could not find anything close to this car in terms of design, high-end finish, and performance for the $15K I paid. Get one!
    • Purchased a Used car
    • Used for Having fun
    • Does recommend this car
    Comfort 5.0
    Interior 4.0
    Performance 5.0
    Value 5.0
    Exterior 5.0
    Reliability 4.0
    17 people out of 18 found this review helpful. Did you?
    Yes No
  • I quest they are all right

    I don't know ,I have never own a BMW you are asking me about a I have never seen , I don't even know what the car looks like,I don't know if I would recommend this car to anyone
    • Purchased a Used car
    • Does not recommend this car
    Comfort 2.0
    Interior 3.0
    Performance 3.0
    Value 3.0
    Exterior 2.0
    1 person out of 36 found this review helpful. Did you?
    Yes No
  • Worth every penny and then some!

    Flat out, great car! Fast, smooth and stylish. Super reliable. Love the design. This model will never go out of style. A + all the way!
    • Purchased a Used car
    • Used for Having fun
    • Does recommend this car
    Comfort 4.0
    Interior 5.0
    Performance 5.0
    Value 5.0
    Exterior 5.0
    Reliability 5.0
    4 people out of 4 found this review helpful. Did you?
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  • Fun in the sun!

    The only way to own a BMW 645 is to have a convertible and 6 speed manual transmission. Fantastic combination that offers fantastic performance. Press the sport mode button and the BMW 645 becomes a barely containable beast! The ride is very comfortable. Not overly firm. Just enough bounce to absorb the harsh bumps in the road. The car handles very crisply with the standard suspension setup. Adding the sport package gives you active steering and that makes an already well handling car handle even better. Steering wheel movements are precise. I strongly suggest looking for a car with the winter package that adds heated seats and a heated steering wheel. Seats are very comfortable. Long trips are an absolute joy. Don't be afraid of long trips away from home. The BMW 645's trunk is much larger than it looks even with the soft top storage try down. There aren't to many negative's with this model. The few complaint's I have is.. 1. Only one cup holder 2.the i-drive on early and later models is archaic. There is no Bluetooth, USB, or AUX port on 2004-2006 models. There are several aftermarket solutions available for the consumer that can be added on. 3. Despite it being such a large car the back seat seems smaller than my old BMW 3 series convertible e46 model. 4. The Guage package is seriously lacking. For some reason BMW decided to remove the traditional fuel economy Guage that has graced BMW dashboard's for nearly 40 years. There isn't even a coolant tempature Guage. But, there is an oil temperature guage. I find this all odd. I would have liked to see the fuel economy guage and an option to look at the readouts through the digital readouts that the driver can scroll through. Again, there are aftermarket solutions if the lack of these instruments truly bother someone. The reality is that most of these issues fad away when you start driving, drop the top and hit the gas. The smile on your face will be ear to ear. What to look for when buying a BMW 645? As with every used car purchase it's buyer beware. However if you must buy a used BMW look to see if proper maintenance has been preformed as well as the few major weak spots of the 4.5 liter V8. These engines were known for their excessive leaking of oil and coolant, burning oil and tail pipe smoking. There are 3 repairs that can be costly for an individual but relatively inexpensive at the dealer level as these repairs have become routine. Look for cars that have had oil valve seals, valve cover gaskets, timing cover gaskets, and anything else associated with an oil leak or oil burning repaired. Also look for cars that have had the main coolant pipe replaced as well. Once these repairs have been done they are life time repairs for the most part. Outside of those 3 issues these engines are rock solid can take a ton of hard driving. With proper maintence these motors will last hundreds of thousands of miles. I highly recommend the BMW 6 series.
    • Purchased a Used car
    • Used for Having fun
    • Does recommend this car
    Comfort 5.0
    Interior 5.0
    Performance 5.0
    Value 5.0
    Exterior 5.0
    Reliability 4.0
    5 people out of 5 found this review helpful. Did you?
    Yes No
  • Solid car!

    This car checked all my boxes for a elegant GT sport car... Fun, nimble machine! A blast in sports mode. Not crazy about the firmness of the run-flat tires.
    • Purchased a Used car
    • Used for Having fun
    • Does recommend this car
    Comfort 4.0
    Interior 5.0
    Performance 4.0
    Value 5.0
    Exterior 4.0
    Reliability 4.0
    1 person out of 1 found this review helpful. Did you?
    Yes No
  • Can't wait to own the 645

    This vehicle handle very nice and I was not expecting such a quality performance in an older model. The BMW 645 definitely surpasses its competition in every category in my opinion. The perfect car for a nice sunday drive or just everyday for that matter.
    • Purchased a Used car
    • Does recommend this car
    Comfort 5.0
    Interior 5.0
    Performance 5.0
    Value 5.0
    Exterior 5.0
    1 person out of 1 found this review helpful. Did you?
    Yes No
  • The car of my dreams

    Pure joy to own and drive! I purchased my 645ci convertible certified pre-owned from a BMW dealer in Naples. At the time, it was 3 years old with only 4,ooo miles on the odometer. I owned the car for 8 years and enjoyed every minute of it. It served me very well, but as with all expensive imports, I wouldn't own one without a warranty. When the CPO warranty was close to expiration, I purchased another extended warranty. It paid for itself twice over due to some expensive repairs in the final 2 years of ownership. That notwithstanding, I wouldn't hesitate to buy another 6 series convertible. It was a sad day when I sold it, but I was moving out of the country on assignment with my company and had no choice. I ran into the new owner last week, and he said he's enjoying it every bit as much as I did.
    • Purchased a Used car
    • Used for Commuting
    • Does recommend this car
    Comfort 5.0
    Interior 5.0
    Performance 5.0
    Value 4.0
    Exterior 5.0
    Reliability 4.0
    1 person out of 1 found this review helpful. Did you?
    Yes No
  • Perfect Sports Carf

    The 645ci Vert is an amazing car till this day. Fast Reliable sexy. what more do you want. i would recommend to any one looking for a bmw
    • Purchased a Used car
    • Used for Having fun
    • Does recommend this car
    Comfort 5.0
    Interior 5.0
    Performance 5.0
    Value 5.0
    Exterior 5.0
    Reliability 5.0
    1 person out of 1 found this review helpful. Did you?
    Yes No
  • Best Bimmer ever made

    This fine coupe is the best car I have ever owned. It has a 325+HP 8 cyl matched with a 6 speed manual that shifts like silk. This car handles like it's on rails on high speed turns, & stops straight on a dime. With the cruise control set at 75mph I get 28-30 mpg. Built for comfort & speed in 2004 this six coupe is the first generation since the 1988 635
    • Purchased a Used car
    • Used for Having fun
    • Does recommend this car
    Comfort 5.0
    Interior 5.0
    Performance 5.0
    Value 5.0
    Exterior 5.0
    Reliability 5.0
    2 people out of 2 found this review helpful. Did you?
    Yes No
  • Beautiful car

    It is a beautiful car but the maintanance is a bit on the expensive end. Really fun to drive and enjoy with family
    • Purchased a Used car
    • Used for Having fun
    • Does recommend this car
    Comfort 4.0
    Interior 4.0
    Performance 4.0
    Value 4.0
    Exterior 5.0
    Reliability 3.0
    1 person out of 1 found this review helpful. Did you?
    Yes No

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FAQ

What trim levels are available for the 2004 BMW 645?

The 2004 BMW 645 is available in 1 trim level:

  • 645Ci (2 styles)

What is the MPG of the 2004 BMW 645?

The 2004 BMW 645 offers up to 18 MPG in city driving and 26 MPG on the highway. These figures are based on EPA mileage ratings and are for comparison purposes only. The actual mileage will vary depending on vehicle options, trim level, driving conditions, driving habits, vehicle maintenance, and other factors.

Is the 2004 BMW 645 reliable?

The 2004 BMW 645 has an average reliability rating of 4.3 out of 5 according to cars.com consumers. Find real-world reliability insights within consumer reviews from 2004 BMW 645 owners.

Is the 2004 BMW 645 a good Coupe?

Below are the cars.com consumers ratings for the 2004 BMW 645. 90.5% of drivers recommend this vehicle.

4.6 / 5
Based on 21 reviews
  • Comfort: 4.5
  • Interior: 4.5
  • Performance: 4.7
  • Value: 4.5
  • Exterior: 4.7
  • Reliability: 4.3
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