I own a 2020 sti and i have like 8.5k miles on it. I flat foot shifted I would say about 5-20 times in the span of 2 days. Now, when I do a cold start, white smoke comes out of the exhaust and it really smells like burnt plastic or rubber or something. My coolant keeps dropping but when I go out for a drive and check it, it comes back and I am so confused on what is going on with my car. I also had a cylinder 4 misfire but it isn’t occuring anymore and only happened twice. Plz help!