Used BMW 1 Series Buying Guide: The E87 N47 Chain, the F20 Generation Split, and What the MOT History Shows

The E87 N47 chain and the rear-wheel-drive vs front-wheel-drive generation split

The E87 (2004–2011) is the only rear-wheel-drive premium hatchback in its class — if that driving character matters to you, it is a genuinely special car. The downside is age, N47 diesel chain risk, and rising costs of maintaining older BMW components. The F20 (2011–2019) moved to FWD and AWD, is more practical, and has aged well in the used market. The F40 (2019–present) is the most refined and technologically current, but commands higher prices. For most buyers, the F20 is the pragmatic choice.

• F40 (2019–present): Most refined. Best technology. Commands premium pricing.
• F20 (2011–2019): Best all-round used buy. Reliable, practical, wide choice of engines.
• E87 (2004–2011): Rear-wheel drive — unique in class. N47 diesel chain risk is the main concern.

E87 N47 diesel: the same chain risk as the 3 and 5 Series — and the same MOT advisory trail

The E87 118d and 120d fitted with the N47 diesel engine share the same rear-mounted timing chain issue as the F10 5 Series and E90 3 Series of the same period. The chain and guide are at the bell-housing end of the engine, meaning gearbox removal is required for repair — meaning costs run £2,000–£3,000 at an independent specialist. Any E87 N47 diesel over 100,000 miles without documented chain history should be treated as a major risk. Listen for a rattle on cold start and factor the replacement cost into your budget if history is unclear. An N47 with a failing chain produces 'engine noise' advisories in the DVSA record when a tester hears it on the ramp during warm-up. One such advisory on an E87 diesel = the chain has been audible and logged.

F20: the practical choice — and why cooling system health matters

The F20 generation moved the 1 Series to a front-wheel-drive platform (shared with the Mini and later Volkswagen Group competitors). It is a more spacious car than the E87, better equipped as standard, and more fuel-efficient. The reliability record is strong — the 1.5-litre three-cylinder (116i, 118i) and 2.0-litre four-cylinder (120i, 118d, 120d) engines are all well-proven. On higher-mileage F20 petrol models, monitor coolant condition — 'coolant level low' or overheating-related DVSA advisories on any F20 are a signal worth investigating. The xDrive AWD system on some F20 models is optional and adds running cost without a significant benefit for most UK driving — save money with a standard FWD model unless you have a specific reason.

118d and 120d: the running cost sweet spot for 10,000–20,000 miles a year

For buyers covering 10,000–20,000 miles per year, the 118d (150ps) and 120d (190ps) diesel variants represent the best value in the range. Both return 55–62mpg on a run, have a long service interval, and are the most common used 1 Series engines — meaning a wide pool of stock and competitive servicing rates. The 120d in particular is well-matched to motorway use and pulls strongly from low revs. If you do under 10,000 miles, the 118i petrol makes more sense — simpler, no DPF.

F40: the most refined option for buyers who can stretch the budget

The F40 (2019–present) is the current generation and brings the 1 Series up to modern premium hatchback standards. It is quieter, better equipped, and has stronger driver assistance technology than the F20. Early F40 cars are entering the used market in the £15,000–£20,000 range — expect 2020–2022 cars with 30,000–50,000 miles. Reliability has been very good so far, with no significant recurring faults established at this mileage.

What your budget buys on an E87, F20 or F40

At £3,500–£6,000 you are buying an E87 or early F20 with 80,000–120,000 miles. Budget for potential N47 chain work on E87 diesels. At £7,000–£12,000 you are in the mainstream F20 sweet spot — 2014–2017 cars with 50,000–80,000 miles. £13,000–£20,000 covers later F20 facelift cars or early F40 examples.