Help: What is the problem of short-term oil cut-off of Wing Shen CVT 1.8?

It is suggested that Wing Shen 1.8 4B 10, which occasionally runs at a good speed on the road, is a high-speed engine with high compression ratio. It is better to use No.97 oil, but it is said that high-speed engines are always prone to carbon deposition when running in urban areas, which should be beneficial. Wing Shen's engine is imported, and the quality is absolutely acceptable. The manufacturer will set the first Paul kilometer at 1000 kilometers. I'm confident that this engine doesn't need trouble to run in, so you don't have to worry about the initial problems of the engine. Rest assured, drive safely!