In 1973 he started working with the band Chicago as a sideman, playing on the albums Chicago VI and Chicago VII before officially joining the band in 1975. He subsequently appeared on the albums Chicago VIII through Chicago XIV. Other appearances, besides Mendes and Chicago also include The Jacksons' 1978 album Destiny. Oliveira left Chicago in 1981, and he is now teaching music in Brazil. He also does session and production work. He briefly reunited with Chicago in September 2010 on the occasion of the band's concert at the HSBC Arena in Rio performing Happy Man.