It is difficult to start the vehicle or oil supply is not sufficient in winter especially in the north. If the vehicle is inspected and there is no problem, then please remove the filter screen of fuel sensor in oil tank to improve the situation of lack of oil supply. The principle is: water in fuel oil freezes to block the filter screen of fuel sensor to make oil supply unsmooth in cold winter. For the vehicle with the engine with electronic injection and common rail, you’d better add fuel first filter with large flow (or a first filter with integrated oil and water separation) to guarantee fuel quantity and to protect the engine. Note: for the vehicle without fuel sensor, please fill fuel with high quality to avoid that filtering effect is lost and new fault is caused.