In concluding the 2017 season as champion of the Porsche Carrera Cup Deutschland, the Norwegian demonstrated a particularly impressive level of consistency. In addition to six race wins, the young driver also finished on the podium in 12 of the season’s 14 races. Olsen also demonstrated his talent in the international Porsche Mobil 1 Supercup. After netting two wins, he finished the season second overall and was crowned top rookie. In 2018, Olsen progressed further as a Porsche Young Professional at his international GT3 outings as well as in the European Le Mans Series, where he won the race in Portimao in the Porsche 911 RSR fielded by the Proton Competition customer team.

 The career of Dennis Olsen
 2019 Porsche Young Professional
1st Intercontinental GT Challenge 12h Bathurst
 2018 Porsche Young Professional
European Le Mans Series
Nürburgring 24 Hours
 2017 Porsche Junior
1st Porsche Carrera Cup Deutschland
2nd Porsche Mobil 1 Supercup
1st Porsche Mobil 1 Supercup (rookie classification)
 2016 Porsche Junior
3rd Porsche Carrera Cup Deutschland
1st Porsche Carrera Cup Deutschland (rookie classification)
 2015 7th Formula Renault 2.0 Euro Cup and 14th NEC
 2014 1st Formula Renault 2.0 Euro Cup
 2013 3rd Formula Renault 2.0 NEC
 2012 1st German Championship, KF1
 2011 1st World Series Karting Final Cup
1st North European Championship