The recommended oil for a Ford Fiesta 1.6 diesel depends on the year of manufacture and specific engine code. You
must consult your owner's manual for the precise specification. The manual will specify the correct oil viscosity (e.g., 5W-30, 5W-40, 10W-40) and the required oil quality standard (e.g., ACEA C2, ACEA C3, API CF).
Using the wrong oil can severely damage your engine. Don't rely on general advice; always check your owner's manual.
