Past few race weekends I have had traces of oil on the back of my car, seems that oil is being blown up the dip stick tube and then down the outside of the tube and then down to 4" tube and all the way to back of my car.

Any one else have/had dip stick issues and oil being pushed up the tube? What is best way to solve (as when at the track I just ran tape around so it, but that makes it hard to check oil)?