Is the oil imported from Japan fake?

Now I feel that there are different opinions about Japanese engine oil on the Internet, especially the previous high-powered incident. Everyone in the basic circle knows that there is something fishy about this, but I can't deny that the experience of using this oil is no problem. Moreover, Japan's Nissin engine oil is still the initial oil for 70% of Japanese cars. I look at the problem from the perspective of a bystander. After all, I don't use Japanese engine oil now, but German GT engine oil. I only care about power, silence and fuel consumption. It would be better if it could be cheaper, haha