Similar to the Peugeot 206, the 306’s rear torsion bar suspension wears out, leading to clunking noises, erratic handling, and noticeable negative camber (wheels pointing inward at the top). Essential Maintenance
It is notoriously loud, particularly on cold starts, earning it a reputation as a "rattly" engine, typical of 1990s diesel technology.
These engines were popular for running on biofuels, specifically vegetable oil, provided they were equipped with the robust Bosch fuel pump, rather than the Lucas system. Common Issues and Maintenance
Owners aiming for high-mileage vegetable oil usage often look for Bosch injection pump conversions over the standard Lucas pumps. Verdict: The P306D Today