[6] Aase would again race in the World Challenge for Endurance Drivers Series in 1980, driving for Alan Johnson.
Aase would move over to IMSA in 1982 with Kendall Racing where he would finish the season 10th in points with three poles, three podiums, and a win.
The year after, Aase would change teams again, this time driving a Toyota Celica for the All American Racers.
[9] Over the next seven years, Aase would race for the All American Racers, eventually ending his IMSA career in 1989 with seven wins, sixteen podiums, and four poles.
Four years later, Aase would enter the 2000 Bosch Sports Car Summerfest at the Glen in the Grand American Sports Car Series, driving a Porsche 911 for AASCO Performance with drivers Bobby Oneglia and Andy Hajducky.