The standard of China's national standard is still the level of API SJ, so it is natural to cut corners. If your car has a problem of high fuel consumption, if you use 10w- American, high-quality goods and Shell to meet this requirement in Europe, it will be more expensive, which is useless than using American 40 for 5w-40. According to the idea of old technology, you should try 5w-50 or 10w-50. According to the new technology, you can try imported engine oil that meets the European ACEA C3 standard, and don't expect engine oil from 4S stores.