BMW 5 Series 518d.
What to Check Before Buying.

The BMW 5 Series 518d suits cost-conscious executive car buyers who prioritise running costs over outright performance. This entry-level diesel variant delivers excellent fuel economy, often exceeding 55mpg in real-world driving, making it ideal for high-mileage motorway commuters. The 2.0-litre diesel engine produces around 150bhp, which feels adequate rather than energetic in such a large saloon, though the refined cabin and quality interior compensate for the modest performance. When buying a used 518d, check the service history meticulously as BMW's longer service intervals require quality maintenance to avoid costly repairs. Inspect the diesel particulate filter for regeneration issues, particularly on cars used primarily for short urban journeys. Listen for any unusual noises from the timing chain, which can stretch on higher-mileage examples. Verify that all electronic systems function correctly, as electrical gremlins can prove expensive to diagnose and repair. The 518d represents sensible choice for buyers wanting 5 Series prestige without premium running costs, provided you select a well-maintained example with complete documentation.

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