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

The BMW 5 Series 520d ED (EfficientDynamics) is ideal for high-mileage executive car buyers who prioritise running costs without sacrificing refinement. This variant targets company car drivers and motorway commuters seeking the 5 Series experience with lower tax bills and impressive fuel economy, typically achieving 55-65 mpg in real-world driving. The 2.0-litre diesel engine delivers adequate performance for most situations, though it can feel less refined than the six-cylinder alternatives under hard acceleration. When inspecting a used 520d ED, scrutinise the service history carefully as these cars often cover substantial mileage. Check for diesel particulate filter issues, especially on examples used primarily for short journeys. Examine the twin-turbo system for smooth boost delivery and listen for any timing chain rattle on startup, a known concern on higher-mileage N47 engines fitted to earlier models. Verify that start-stop and other EfficientDynamics systems function correctly, as repairs can be costly. Given typical usage patterns, comprehensive inspection of suspension components and brake discs is essential before purchase.

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