Audi A6 vs BMW 5 Series: Which is better for you?

The Audi A6 and BMW 5 Series have set the standard for executive cars for decades. Both models feature a clean, elegant design, strong engines, and refined interiors. They have stayed relevant and desirable, year after year.

In a BMW 5 Series vs Audi A6 comparison, the differences are subtle, and both offer a high level of luxury. Nevertheless, let’s take a closer look at each to see what makes them special.

Quick comparison at a glance

Without going into too much detail, let’s compare the BMW 5 Series and the Audi A6 across several key categories:

Now, we’ll take a closer look at these and other key parameters to see how the two models stack up.

Price comparison

The 2025 Audi A6 starts at £52,010 and goes up to £72,080. A used Audi A6 from 2018 typically costs between £12,000 and £14,000, depending on condition.

The BMW 5 Series 2025 model ranges from £52,285 to £88,125 new. In comparison, you can expect to pay between £12,000 and £16,000 for a used BMW 5 Series from 2018.

Overall, these cars have similar starting prices, but the 5 Series can cost more overall, costing slightly more than comparable models.

Audi A6 vs BMW 5 Series: Size and dimensions

Audi A6 saloon:

• Length: 4,939 mm
• Width: 1,886 mm
• Height: 1,457 mm

Audi A6 Avant estate:

• Length: 4,939 mm
• Width: 1,886 mm
• Height: 1,470 mm

BMW 5 Series saloon:

• Length: 5,060 mm
• Width: 1,900 mm
• Height: 1,515 mm

It’s clear that the 5 Series is slightly larger in every dimension, while the A6 saloon and Avant are very similar in size.

Engine options

In the A6 line-up, there are four-cylinder diesel options, including a 2.0‑litre 40 TDI with good everyday efficiency. For those wanting more power, there are V6 engines available, both petrol (45 TFSI or 55 TFSI) and diesel (50 TDI). The A6 also offers mild‑hybrid and plug-in hybrid variants.

Most petrol and diesel engines come with quattro all-wheel drive, except the base 2.0 TDI, which is front-wheel drive only.

The 5 Series includes a four‑cylinder diesel (like 520d), like Audi’s 40 TDI, for those who prioritise fuel economy. For extra smoothness and luxury, there are also larger petrol and diesel engines, including V‑configuration options. Additionally, the 5 Series offers plug-in hybrid variants that combine petrol engines with battery‑electric assistance.

BMW’s xDrive (AWD) is optional on many models, but the standard configuration for most petrol and diesel versions is rear-wheel drive.

Performance

In the Audi A6, driving is quiet and controlled. Optional four-wheel steering adds agility in tight spots and confidence on motorways, and adaptive suspension smooths out rough roads without compromising control.

The BMW 5 Series leans towards a more engaging and dynamic ride. It delivers a responsive driving experience that makes corners feel lively and roads more connected, though slightly firm over uneven surfaces.

Interior

The A6 models offer an interior that feels spacious, calm, and highly refined. The cabin focuses on practicality, with well-laid-out controls and generous legroom. Materials feel premium, and the overall style creates a serene environment.

The 5 Series interior, by contrast, brings on a more driver-oriented experience. The cabin combines high-quality materials with a sporty layout. Space is comfortable, though slightly less airy than the A6, and the styling has a more dynamic feel.

Boot space

The Audi A6 offers a generous 530 litres of boot space, with a well-shaped and easily accessible area for luggage. The A6 Avant estate expands this significantly: 565 litres with all seats up and up to 1,680 litres with the 40/20/40 split-folding rear seats down. Hybrid models have slightly less room due to the battery under the floor, but a powered tailgate and electric retracting load cover keep the car practical and user-friendly.

The BMW 5 Series provides a similar boot to the A6, at 530 litres, also with a well-shaped design and easy access. The rear seats don’t fold flat on most models, which limits flexibility for larger items. Still, the space is ample for everyday luggage, shopping, or a couple of suitcases.

Technology

The Audi A6 comes with a standard 8.8-inch infotainment system, with an optional 10.1-inch screen if the Technology Pack is fitted. The MMI touchscreen replaces the rotary controller with a touchscreen that has haptic feedback. The A6 also offers a head-up display and configurable digital dials.

The BMW 5 Series features the iDrive system, which controls navigation, media, and vehicle settings through a rotary controller or touchscreen, depending on the model. Some variants come with a larger infotainment screen (12.3 inches) and adaptive functions, including adjustable display layouts, driver-focused menus, and integration with features like Variable Damper Control.

Safety and driver assistance

The Audi A6 provides excellent visibility with front and rear parking sensors and a rear-view camera as standard. Higher-spec models or those with the Technology Pack include a head-up display that shows key alerts and navigation in the driver’s line of sight. The A6 also incorporates Audi’s advanced driver assistance systems, such as adaptive cruise control, lane-keeping assist, and collision warning.

The BMW 5 Series’ standard features include multiple airbags, stability and traction control, and parking sensors. Higher trims add adaptive cruise control, lane departure warning, blind-spot monitoring, and automatic emergency braking.

The A6 and 5 Series both earned 5‑star Euro NCAP ratings for crash safety.

Running costs and ownership

When considering long-term costs, the 5 Series and A6 both offer strong performance, but running costs and ownership can vary.

Fuel and energy efficiency

The A6 40 TDI diesel returns around 46.8 mpg on average, and the V6 petrols are thirstier. The 50 TFSIe plug-in hybrid achieves up to 235.4 mpg official figures in earlier tests, with an electric-only range of up to 34 miles.

The 5 Series 520d Efficient Dynamics is the most economical: 56.5 mpg WLTP for post-2019 mild hybrid models. The plug-in hybrid 530e can reach 166 mpg in later versions, with an electric range of up to 37 miles.

Insurance

The A6 insurance groups start at 33 for the 2.0-litre diesel and rise to 50 for the most powerful RS6. The 5 Series groups range from 28 to 46, depending on the variant.

Both vehicles will carry higher premiums than smaller, less powerful cars, but the common mid-range diesel versions (A6 2.0 TDI Sport, 5 Series 520d SE) are easier to insure.

Servicing

A used A6 over three years old benefits from fixed-price servicing: from £185 for a minor service and £355 for a major service on 2.0-litre engines. Larger engines cost slightly more.

BMW servicing is roughly on par with Audi, but competitive dealer packages are less common.

Tax

Both BMW 5 Series and A6 variants cost £195/year, with an extra £425/year luxury tax for cars over £40,000 new (years 2-5).

Depreciation

Both cars hold value well in the luxury segment, though high-spec models and hybrids tend to depreciate slightly faster due to technology updates.

How Carplus can help with financing the car you want

We understand that finding the right used car, especially if you’re looking into luxury options like the Audi A6 or BMW 5 Series, can feel overwhelming. At Carplus, we help you make the entire process simple and straightforward.

We guide you through every step, from reviewing rates and options to the paperwork, so no detail is left unclear or confusing. This way, you can be confident that you are making the right decision for your circumstances. Get started today!

Who is the Audi A6 for?

The Audi A6 suits those who value a calm and refined driving experience. It also works well for people who need a practical and spacious car for everyday life.

The Allroad variant, in particular, offers the same feel with a touch more capability.

Who is the BMW 5 Series for?

The BMW 5 Series is designed for drivers who enjoy a dynamic and engaging ride. For instance, the Sport trim adds a slightly firmer setup and a more focused feel for a livelier character. The car also appeals to those who want a vehicle that carries prestige and makes a statement on the road.

Verdict

Both the Audi A6 and BMW 5 Series deliver the level of polish you’d expect from a luxury car. Each model offers clear value, a strong reputation, and a sense of confidence that carries through everyday use. Pricing, running costs, and long-term ownership feel predictable and reassuring, which makes either option a solid step into the luxury segment.

At the end of the day, pick the one that aligns with your priorities!