It's difficult to speculate on what's going to happen, or when. You may find this piece useful - it's mostly factual information:
https://www.reuters.com/article/us-u...-idUSKBN1JM1GQ
IIRC, BMW was the world's most profitable car company in 2016, so it may be better positioned than many other auto manufacturers to absorb some or all of any increased tariffs that are imposed.