BMW 5 Series 520d.
What to Check Before Buying.

The BMW 5 Series 520d is ideal for business drivers and long-distance commuters who prioritise running costs without sacrificing executive presence. This diesel variant delivers impressive fuel economy, typically achieving 50-60 mpg in real-world driving, while the 2.0-litre engine provides adequate performance for motorway cruising. The 520d sits as the entry-level diesel option, meaning it lacks some of the performance punch of the 530d but compensates with lower company car tax and reduced running costs. When buying used, check the service history meticulously as the N47 and B47 engines can suffer timing chain issues if oil changes have been neglected. Inspect for oil leaks around the sump and look for evidence of EGR valve problems, which can cause rough idling. Request proof of regular BMW dealer or specialist servicing, ideally at 12-month intervals. Also verify the condition of the dual-mass flywheel, particularly on higher-mileage examples, as replacement can be costly. A comprehensive Folt vehicle check will reveal the car's service history and highlight any potential concerns before purchase.

The average used car has 3+ known model faults the seller won't mention.