Hyundai Sonata YF

The Sonata YF arrived in September 2009 and decisively changed Hyundai's familiar family-sedan silhouette. Korean specification records front-wheel drive, a 165-PS 2.0-litre petrol four and either a six-speed manual or automatic; a genuine-parts catalogue record for a YF confirms G4KD.

This sedan's engine is best judged in the context of a calm, longer drive. If its operation raises a question, the order remains simple: read the data, inspect the cylinders, then discuss defect assessment and cost — not the reverse.

A YF works when its expressive shape is backed by quiet, even mechanical behaviour. A road test, a start after standing and the service documents say more than a generic conversation about the Sonata.