BMW 5 Series 535i.
What to Check Before Buying.

The BMW 5 Series 535i appeals to buyers seeking a compelling blend of executive refinement and genuine performance from a straight-six petrol engine. This variant delivers an impressive 302bhp, offering effortless motorway cruising and strong overtaking capability whilst maintaining better smoothness than four-cylinder alternatives. The 535i's main strength lies in its proven N55 engine, which is generally more reliable than earlier N54 units, though it can still develop issues with the vacuum pump and oil filter housing gasket as mileage increases. When inspecting a used 535i, check for complete BMW service history with evidence of regular oil changes, as the twin-scroll turbo engine demands quality maintenance. Examine the exhaust system for rattles or corrosion, particularly on pre-2014 models, and test the eight-speed automatic gearbox for smooth shifts without hesitation. Higher mileage examples may need suspension bush replacements. Running costs deserve consideration too, as fuel economy averages around 32mpg and road tax falls into higher brackets for pre-2017 models.

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