2021 BMW 5 Series Sedan vs. 2020 Cadillac CT6

Detailed Review, Specifications & Comparison

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Safety

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The 5 Series Sedan has standard PostCrash iBrake, which automatically apply the brakes in the event of a crash to help prevent secondary collisions and prevent further injuries. The CT6 doesn’t offer a post collision braking system: in the event of a collision that triggers the airbags, more collisions are possible without the protection of airbags that may have already deployed.

The 5 Series Sedan’s driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The CT6 doesn’t offer a driver alert monitor.

Both the 5 Series Sedan and the CT6 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning, available all wheel drive, night vision systems and around view monitors.

For its top level performance in IIHS driver and passenger-side small overlap frontal, moderate overlap frontal, side impact, roof strength and head restraint tests, its standard front crash prevention system, and its headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the 5 Series Sedan its highest rating: “Top Pick Plus” for 2019, a rating granted to only 82 vehicles tested by the IIHS. The CT6 has not been tested, yet.

Warranty

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The 5 Series Sedan’s corrosion warranty is 6 years longer than the CT6’s (12 vs. 6 years).

BMW pays for scheduled maintenance on the 5 Series Sedan for 3 years and 36,000 miles. BMW will pay for oil changes, lubrication and any other required maintenance. Cadillac only pays for the first scheduled maintenance visit on the CT6.

Reliability

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J.D. Power and Associates’ 2019 survey of the owners of three-year-old vehicles provides the long-term dependability statistics that show that BMW vehicles are more reliable than Cadillac vehicles. J.D. Power ranks BMW 7th in reliability, above the industry average. With 44 more problems per 100 vehicles, Cadillac is ranked 23rd.

From surveys of all its subscribers, Consumer Reports’ December 2019 Auto Issue reports that BMW vehicles are more reliable than Cadillac vehicles. Consumer Reports ranks BMW 13 places higher in reliability than Cadillac.

Engine

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The M550i’s 4.4 turbo V8 produces 23 more horsepower (523 vs. 500) than the CT6 Platinum’s optional 4.2 turbo V8.

Fuel Economy and Range

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On the EPA test cycle the 5 Series Sedan gets better fuel mileage than the CT6:

MPG

5 Series Sedan

RWD

530i 2.0 turbo 4-cyl.

25 city/33 hwy

540i 3.0 turbo 6-cyl. Hybrid

25 city/32 hwy

AWD

530i 2.0 turbo 4-cyl.

23 city/32 hwy

540i 3.0 turbo 6-cyl. Hybrid

23 city/31 hwy

M550i 4.4 turbo V8

17 city/25 hwy

CT6

AWD

3.6 DOHC V6

18 city/27 hwy

3.0 turbo V6 Hybrid

14 city/25 hwy

Regenerative brakes improve the 5 Series Sedan’s fuel efficiency by converting inertia back into energy instead of wasting it. The CT6 doesn’t offer a regenerative braking system.

Tires and Wheels

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The 5 Series Sedan’s optional 245/35R20 front and 275/30R20 rear tires provide better handling because they have a lower 35 series front and 30 series rear profile (height to width ratio) that provides a stiffer sidewall than the CT6 Premium Luxury/Platinum’s 40 series tires.

Changing a flat tire near traffic can be dangerous and inconvenient. The run-flat tires standard on the 5 Series Sedan can be driven up to 50 miles without any air pressure, allowing you to drive to a service station for a repair. The CT6 doesn’t offer run-flat tires.

Suspension and Handling

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The 5 Series Sedan 540i/M550i offers active sway bars, which help keep it flat and controlled during cornering, but disconnect at lower speeds to smooth the ride and offer greater off-road suspension articulation. This helps keep the tires glued to the road on-road and off. The CT6 doesn’t offer an active sway bar system.

The M550i offers an available adjustable active suspension system, which counteracts cornering forces actively, limiting body roll and improving handling and stability. Cadillac doesn’t offer an active suspension on the CT6.

For better maneuverability, the 5 Series Sedan’s turning circle is .6 feet tighter than the CT6’s (39.4 feet vs. 40 feet).

Chassis

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The BMW 5 Series Sedan may be more efficient, handle and accelerate better because it weighs about 300 to 350 pounds less than the Cadillac CT6.

The 5 Series Sedan is 10 inches shorter than the CT6, making the 5 Series Sedan easier to handle, maneuver and park in tight spaces.

Cargo Capacity

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A low lift-over trunk design makes loading and unloading the 5 Series Sedan easier. The 5 Series Sedan’s trunk lift-over height is 26.2 inches, while the CT6’s liftover is 29.1 inches.

The 5 Series Sedan’s standard rear seats fold to accommodate long and bulky cargo. The CT6 doesn’t offer folding rear seats, only a ski pass-through.

Ergonomics

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The CT6 Premium Luxury/Platinum’s cornering lamps activate a lamp on the front corner when the turn signal is activated. The 5 Series Sedan’s standard adaptive cornering lights turn the actual headlight unit up to several degrees, depending on steering wheel angle and vehicle speed. This lights a significant distance into corners at any speed.

The 5 Series Sedan’s optional Parking Assistant Plus can parallel park or back into a parking spot by itself, starting, stopping and changing direction automatically. Optional Remote Control Parking will park and retrieve your car remotely: press a button and watch it park itself. This is ideal for tight locations. The CT6 Premium Luxury/Platinum’s automatic parking system does not offer parking by remote control.

Model Availability

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The 5 Series Sedan is available in both rear-wheel drive and all-wheel drive configurations. The CT6 doesn’t offer a two-wheel drive configuration.

Economic Advantages

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Insurance will cost less for the 5 Series Sedan owner. The Complete Car Cost Guide estimates that insurance for the 5 Series Sedan will cost $2075 less than the CT6 over a five-year period.

The 5 Series Sedan will cost the buyer less in the long run because of its superior resale value. The IntelliChoice estimates that the 5 Series Sedan will retain 36.99% to 39.18% of its original price after five years, while the CT6 only retains 33.34% to 34.39%.

According to The Car Book by Jack Gillis, the 5 Series Sedan is less expensive to operate than the CT6 because it costs $618 less to do the manufacturer’s suggested maintenance for 50,000 miles. Typical repairs cost less on the 5 Series Sedan than the CT6, including $65 less for front brake pads, $42 less for a starter, $150 less for fuel injection and $22 less for a fuel pump.

IntelliChoice estimates that five-year ownership costs (depreciation, financing, insurance, fuel, fees, repairs and maintenance) for the BMW 5 Series Sedan will be $7981 to $23250 less than for the Cadillac CT6.

Recommendations

© 1999 - 2020 Advanta-STAR Automotive Research. All rights reserved. This vehicle comparison and all of the content in it are provided only by license from Advanta-STAR Automotive Research Corporation of America. If you are not a legally licensed user of this vehicle comparison, it is against federal law to access it, copy it, forward it or use it in any manner whatsoever. Any unauthorized use of this vehicle comparison is a violation of U.S. and international law and is punishable criminally and civilly. 6IUEX-0KENZ 45.55.47.189 2020/10/30

The BMW 5 Series outsold the Cadillac CT6 by almost five to one during 2019.

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