2019 Acura RLX vs. 2019 Audi A6

Detailed Review, Specifications & Comparison

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Safety

The RLX has standard whiplash protection, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the whiplash protection system moves the headrests forward to prevent neck and spine injuries. The A6 doesn’t offer a whiplash protection system.

Both the RLX and the A6 have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, rearview cameras and available around view monitors.

For its top level performance in all IIHS frontal, side, rear impact and roof-crush tests, its standard front crash prevention system, and its headlight’s “Acceptable” rating, the Insurance Institute for Highway Safety grants the RLX the rating of “Top Pick” for 2018, a rating granted to only 100 vehicles tested by the IIHS. The A6 has not been tested, yet.

Warranty

Acura’s powertrain warranty covers the RLX 2 years and 20,000 miles longer than Audi covers the A6. Any repair needed on the engine, transmission, axles, joints or driveshafts is fully covered for 6 years or 70,000 miles. Coverage on the A6 ends after only 4 years or 50,000 miles.

Reliability

The engines in the RLX have a single overhead cam for simplicity. The engine in the A6 has dual overhead cams, which add to the number of moving parts and the complexity of the cylinder heads.

J.D. Power and Associates’ 2018 Initial Quality Study of new car owners surveyed provide the statistics that show that Acura vehicles are better in initial quality than Audi vehicles. J.D. Power ranks Acura 20th in initial quality. With 6 more problems per 100 vehicles, Audi is ranked 25th.

Engine

The RLX Sport Hybrid’s standard 3.5 SOHC V6 hybrid produces 42 more horsepower (377 vs. 335) than the A6’s 3.0 turbo V6 hybrid.

Fuel Economy and Range

On the EPA test cycle the RLX Sport Hybrid gets better fuel mileage than the A6 55 TFSI (28 city/29 hwy vs. 22 city/29 hwy).

An engine control system that can shut down half of the engine’s cylinders helps improve the RLX’s fuel efficiency. The A6 doesn’t offer a system that can shut down part of the engine.

The RLX has a standard cap-less fueling system. The fuel filler is automatically opened when the fuel nozzle is inserted and automatically closed when it’s removed. This eliminates the need to unscrew and replace the cap and it reduces fuel evaporation, which causes pollution. The A6 doesn’t offer a cap-less fueling system.

Transmission

A 10-speed automatic is standard on the Acura RLX V6, for better acceleration and lower engine speed on the highway. Only a seven-speed automatic is available for the A6.

Tires and Wheels

The RLX’s tires provide better handling because they have a lower 40 series profile (height to width ratio) that provides a stiffer sidewall than the A6’s standard 45 series tires.

Chassis

The Acura RLX may be more efficient, handle and accelerate better because it weighs up to about 300 pounds less than the Audi A6.

The RLX uses computer-generated active noise cancellation to help remove annoying noise and vibration from the passenger compartment, especially at low frequencies. The A6 doesn’t offer active noise cancellation.

Passenger Space

The RLX has 1 inch more front legroom, 1.8 inches more front shoulder room, 1.4 inches more rear legroom and .5 inches more rear shoulder room than the A6.

Cargo Capacity

The RLX has a much larger trunk than the A6 (14.9 vs. 13.7 cubic feet).

Ergonomics

The RLX Sport Hybrid has a standard remote vehicle starting system, so the vehicle can be started from inside the driver's house. This allows the driver to comfortably warm up the engine before going out to the vehicle. The climate system will also automatically heat or cool the interior. The A6 doesn’t offer a remote starting system.

Model Availability

The RLX is available in both front-wheel drive and all-wheel drive configurations. The A6 doesn’t offer a two-wheel drive configuration.

© 1991-2018 Advanta-STAR Automotive Research. All rights reserved.

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