Kammala wannan magana: Bayan kakar wasa, ya sauka daga IndyCar cikakken lokaci don matsawa zuwa shirin Penske na IMSA SportsCar Championship. An shigar da Castroneves a cikin duka IndyCar Grand Prix da Indianapolis 500 a matsayin wani ɓangare na kamfen ɗin sa na 2018; ya shirya don tseren ta hanyar raba bayanan kula tare da abokan aikinsa da kuma fahimtar kansa da motar. Tawagar Castroneves ta yi amfani da dabarar da ta ba shi damar kammala na shida a cikin IndyCar Grand Prix. A Indianapolis 500, ya fara daga matsayi na takwas, kafin ya rasa iko da motarsa a juya na hudu kuma ya fadi a kan 146th lap don kammala 27th. A cikin kakar 2019, ya sake shiga duka IndyCar Grand Prix da Indianapolis 500. Castroneves ya gama IndyCar Grand Prix a zagaye biyu a bayan jagororin a cikin 21st. Ya fara 12th a Indianapolis 500, ya gama tseren 18th bayan haɗuwa da motar mota tare da motar James Davison wanda ya ba shi hukuncin kisa. Ya fara da
2020 Indianapolis 500 daga 27th kuma ya gama tseren a 11th.