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.