Before being transferred to Malolos, he was a professor and priest-formator at the St. Alphonsus School of Theology, in Lucena City from 1972-1973, subsequently becoming its vice-rector in 1982-1983 and rector from 1983-1992.

[1] After assignments in the United States, and Germany, he became the vice-rector of St. Alphonsus School of Theology from 1982-1983, subsequently appointed as rector from 1983-1992.

He was consecrated bishop on March 20, 2000, in the Cathedral of San Diego de Alcala in Gumaca, Quezon by Archbishop Antonio Franco, former Apostolic Nuncio to the Philippines.

[3] The principal co-consecrators were Archbishop Gaudencio Borbon Rosales, then-Archbishop of Lipa and Bishop Emilio Zurbano Marquez, then-Bishop of Gumaca.

[4] On August 15, 2003, Oliveros was appointed Apostolic Administrator of the Diocese of Malolos, while remaining in his office as bishop of Boac.