North American T-28 Trojan, flown by Toni Eichhorn at the 2017 Soest Flyin/Airshow.
Had an Oil leak after the first display, but was fixed and flew again on the very next day without any problems.
Pilots webpage:
http://www.t6-team.de/toni_eichhorn.html
Aircraft on Wiki:
https://de.wikipedia.org/wiki/North_American_T-28
Airshow:
http://www.flugtage-soest.de/