The available data indicates that all Peugeot 607 (2000-09) 4DR Saloon 2.0 HDI S models from 1997 are fitted with a diesel engine, accounting for 100% of the sample. Notably, while the model year range extends up to 2009, the data specifically references the year 1997, suggesting a consistent engine and fuel type for that period. The uniformity in fuel type highlights that diesel was the sole fuel choice for this model at that time, which may be of interest to buyers or collectors focusing on diesel variants of the Peugeot 607 from that era.