1994 Honda Civic after run high speed, have alot white smoke

Hi, my car has used to run smooth n well as normal, the day i'm drive to the canberra on morning I run as about 110-120km/hour, then everything is fine when I arrive there, but when I went back from canberra, I were keep run about 130-150km/hour within 1hour 15 minute, then when I park my car to break point, I reliase my car hv alot the white smoke, but that not from my radioator, n I find out my engine oil was only half rest, so I stop the car n wait for the car cool down about one hour until no more smoke, then I keep driving n run as 90-110km/hour, then the car hv no more happen, I wonder is it I need to get my car to make for checking or not, or that jux a small matter because my car hv never drive that fast as that longer?Look foward to wait for your anwer, thank you.