Often when the engine is cold, it may start and immediately die, requiring several attempts. This is usually caused by air leaking into the fuel primer "grenade" or fuel lines.
While the engine is bulletproof, the 306 around it is susceptible to typical 90s-era French car issues. Top 306 1.9D Problems
The 306 is prone to overheating. Radiator leaks, thermostat failures, and brittle hoses can cause serious issues, sometimes leading to warped cylinder heads.
Owners aiming for high-mileage vegetable oil usage often look for Bosch injection pump conversions over the standard Lucas pumps. Verdict: The P306D Today
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