Mineral , semi synthetic or fully synthetic?

[StockEngine]

So hard to backread, I'll just ask tsikot gurus directly. If a vehicle uses synthetic oil, then it should be synthetic all the way? I cannot go back to mineral oil? if the answer is a big NO then i'm good. If I can go back then my next question would be is there a detrimental effect when I switch back to mineral. thanks!,

You can go back to mineral oil. But for direct injection engines its better to use synthetic