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

There are 2,116 used diesel BMW 3 Series under £20,000 for sale from UK dealers on AskCar, as of 30 October 2026. Typical asking price £10,500 (the median: half cost less, half cost more). The cheapest is £1,000. AskCar lists 6,987 used BMW 3 Series across the UK, from 2,629 dealerships.

The middle half of the 2,116 cars are priced between £7,000 and £15,000.

As of 30 October 2026, AskCar lists 580,490 cars and vans from 12,695 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

568 of the 2,116 cars had their price reduced in the last 14 days to 30 October 2026.

Median asking price by year

YearFor sale with a priceMedian asking priceMiddle half priced between
202166£17,800£16,100 to £18,900
2020102£16,800£15,300 to £18,500
2019261£16,500£14,000 to £18,000
2018224£13,500£11,000 to £16,000
2017245£12,500£10,000 to £15,000
2016241£11,000£8,800 to £13,800
2015259£9,300£7,800 to £12,000
2014226£7,500£6,000 to £9,800
2013169£6,800£5,000 to £8,400
2012135£5,000£4,000 to £6,500
201154£4,000£3,300 to £5,900
201045£3,800£3,400 to £4,500
200923£3,400£2,300 to £5,000

Cars for sale now, page 7 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 6,706 priced BMW 3 Series adverts on AskCar as of 30 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

Diesel BMW 3 Series by price

BMW 3 Series prices by year

BMW 3 Series by price

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