2018 BMW 420 2.0L Petrol · EN68 AEP

The 2.0-litre petrol BMW 420 returns roughly 40-45 mpg on a combined cycle, depending on driving style, giving an annual fuel bill of approximately £1,400-£1,800 at current UK pump prices for 10,000 miles. Road tax sits in a reasonable band for a Euro 6 petrol of this age, typically £150-£200 annually, though this specific variant is not subject to the premium-rate diesel surcharge. Insurance for a 420 coupe falls in group 30-38 depending on trim, so expect premiums in the £700-£1,100 range for a typical driver. Routine servicing including oil changes, brake fluid, and filters tends to cost £250-500 at independent BMW specialists, less than franchised dealers. Considering fuel, tax, insurance, and maintenance, expect total annual running costs in the £1,800-£2,200 range, though careful drivers on lower mileage may come in below this.

Begin with a thorough inspection of all four tyres, paying particular attention to the rear pair given the recurring advisories in 2022 and 2024; uneven rear wear on a coupe can indicate alignment or suspension issues, so check for feathering or one-sided wear patterns. The rear brake pads were noted as wearing thin at the 2021 test, so inspect current pad material and the rear disc surface for corrosion or scoring, which is common on rear-axle-heavy coupes. Although no suspension or steering advisories appear in the MOT record, the 420 is known for worn control arm bushes and top mounts at higher mileages, so a bouncy test over speed humps is worthwhile. Check the oil filter housing and valve cover gasket for oil seepage, a known weak point on the B48 2.0-litre petrol engine in this generation. Finally, verify all electronic systems function, including iDrive, parking sensors, and climate control, as repairs outside warranty can be costly on a premium coupe.