BMW 5 Series MHT.
What to Check Before Buying.

The BMW 5 Series MHT (mild hybrid technology) appeals to business professionals and company car drivers seeking lower running costs without compromising the 5 Series' executive presence. The 48-volt mild hybrid system assists the 2.0-litre diesel or petrol engine, delivering improved fuel economy around town and reduced CO2 emissions for favourable benefit-in-kind tax rates. The technology works best in stop-start traffic where the electric motor supports acceleration and enables extended engine-off coasting. When buying used, verify the hybrid battery's health through BMW diagnostics, as replacement costs can be substantial outside warranty. Check the service history confirms regular BMW dealer maintenance, particularly for the mild hybrid components which require specific expertise. Test the stop-start system operates smoothly without hesitation when pulling away. Examine the underside for any signs of battery casing damage, especially on higher-mileage examples used for motorway commuting. The MHT system adds complexity over standard models, so ensure remaining manufacturer warranty coverage or budget for an extended warranty. A comprehensive pre-purchase inspection covering hybrid-specific components provides essential peace of mind with this technology.

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