The specific type of oil for your Peugeot 307 diesel depends on the engine and year of manufacture.
You absolutely must check your owner's manual. This manual will specify the exact oil grade and specifications (e.g., ACEA, API) required for your vehicle.
Trying to use the wrong oil can seriously damage your engine. Don't rely on general advice found online; consult your owner's manual or a Peugeot dealership for the correct information.
