Used diesel BMW 3 Series for sale under £20,000

There are 2,114 used diesel BMW 3 Series under £20,000 for sale from UK dealers on AskCar, as of 31 October 2026. Typical asking price £10,500 (the median: half cost less, half cost more). The cheapest is £1,000. AskCar lists 6,973 used BMW 3 Series across the UK, from 2,626 dealerships.

The middle half of the 2,114 cars are priced between £7,000 and £15,000.

As of 31 October 2026, AskCar lists 583,548 cars and vans from 12,716 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

564 of the 2,114 cars had their price reduced in the last 14 days to 31 October 2026.

Median asking price by year

YearFor sale with a priceMedian asking priceMiddle half priced between
202164£17,800£16,000 to £19,000
2020104£16,800£15,000 to £18,500
2019257£16,500£14,000 to £18,000
2018225£13,500£11,000 to £15,900
2017247£12,500£10,000 to £15,000
2016242£11,000£8,700 to £13,700
2015260£9,300£7,900 to £12,000
2014227£7,500£6,000 to £9,800
2013165£6,800£5,000 to £8,300
2012135£5,000£4,000 to £6,500
201154£4,200£3,300 to £5,900
201045£3,800£3,400 to £4,500
200923£3,400£2,300 to £5,000
200820£3,700£3,000 to £5,800

Cars for sale now, page 13 of 22

Best value first: the cars priced furthest below their AskCar estimate come first, and those without one come after. The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 6,718 priced BMW 3 Series adverts on AskCar as of 31 October 2026.

Each car: year, make, model, engine and trim, power, gearbox, fuel, body, doors, colour; mileage; price and its changes; how the price compares with the AskCar estimate; emissions standard and ULEZ compliance where it holds; MOT; dealer and town; AskCar page.

Cheaper cars like each one, with its price history, are on its AskCar page.

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BMW 3 Series by gearbox, fuel and body

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