Volvo V40 smoking and stalling after using SAE 10W30 oil, speedometer not functioning on Volvo V40

Some Volvo V40 owners report experiencing smoking and stalling issues after using SAE 10W30 oil instead of the recommended 0W30, which can lead to problems with the Exhaust Gas Recirculation (EGR) and Diesel Particulate Filter (DPF). This incorrect oil grade may contribute to engine problems and potentially shorten the engine's lifespan under normal use. Additionally, some owners find that their speedometer malfunctions, either resting at zero or bouncing between speeds, which could indicate faulty sensors or electrical issues unrelated to the oil grade. It is advisable for owners to consult a mechanic to ensure the proper oil grade is used, investigate any underlying engine-related issues, and check for sensor or electrical problems affecting the speedometer.