BMW 3 Series vs Audi A4: Which Is Better? (2026)
BMW 3 Series vs Audi A4 — a full UK comparison covering performance, reliability, running costs, insurance, and which is the better buy in 2026.
BMW 3 Series
Driver's choice
Audi A4
Refined & tech-forward
Head-to-Head Comparison
Green = winner in this category
Pros & Cons
BMW 3 Series
Audi A4
Performance & Engines
Both cars offer a wide range of petrol and diesel engines. The BMW 3 Series starts with the 320i (184ps) and ranges up to the M340i (374ps) xDrive. The Audi A4 starts with the 35 TFSI (150ps) and tops out with the S4 (341ps) for most buyers. On raw performance, BMW's rear-wheel-drive platform gives the 3 Series a more balanced, sporty character — particularly on B-roads.
Reliability
The G20 BMW 3 Series (2019 onwards) has been relatively reliable, though early examples had some reports of oil consumption and N47 timing chain issues on older models. The Audi A4 (B9 generation, 2016 onwards) has had reported issues with DSG gearboxes and infotainment glitches. As with any used executive car, always check full service history and run an MOT history check before buying.
Insurance & Running Costs
Insurance groups range from around 25–40 for the BMW and 24–38 for the Audi, depending on engine and trim. Both cars require annual servicing. BMW's Condition Based Servicing (CBS) system alerts you when service is due, which can stretch intervals. Budget £250–£500 for a full service at an independent specialist, or up to £800+ at a main dealer.
Verdict
Both cars are excellent executive saloons but the BMW 3 Series edges ahead for most buyers. It's more fun to drive, slightly more reliable according to owner surveys, and has the better boot. The Audi A4 fights back with a marginally lower starting price and a more refined interior — it's worth considering if you prioritise comfort over driver engagement.
Choose BMW 3 Series if…
You want the most driver-focused, reliable executive saloon. The 3 Series is one of the best-handling cars in its class.
Choose Audi A4 if…
You prioritise interior refinement and the latest tech over driving feel. The A4's cabin is genuinely premium.
Frequently Asked Questions
Is a BMW 3 Series more reliable than an Audi A4?
Generally yes, based on What Car? and JD Power surveys. The 3 Series (especially the G20 generation from 2019) has scored better than the A4 in most large-scale UK reliability studies.
Which is cheaper to insure — BMW 3 Series or Audi A4?
The Audi A4 sits in marginally lower insurance groups on some base trims, but both cars are broadly similar in insurance cost. Expect insurance group 24–40 for either car depending on engine and trim.
What are the running costs of a BMW 3 Series vs Audi A4?
Running costs are very similar. Both require annual servicing at main dealer or specialist, both sit in similar road tax brackets (£190+/year for post-2017 cars), and fuel economy figures are broadly comparable across equivalent engines.
Which has better resale value — 3 Series or A4?
The BMW 3 Series typically holds its value slightly better than the Audi A4. Both depreciate heavily in the first three years, making a 3–5 year old example particularly good value.
Can I check the MOT history on a used BMW 3 Series or Audi A4?
Yes. Enter any UK registration number into MOTR to see the full MOT history, mileage record, and tax status for any BMW 3 Series or Audi A4 before you buy.