[1] At the end of his studies, he was ordained a secular priest in 1725 and assigned to the Eparchy of Mukacheve, where he later became vicar of the eparchs (bishops) Stefan Olshavskyi (who was his older brother) and Havryil Blazhovskyi.

[3] In a few months he was elected to the position by the clergy, designated by the Empress Maria Theresa, and so confirmed by Pope Benedict XIV on 5 September 1743.

[1] In 1746, Empress Maria Theresa requested Manuil Olshavskyi to undertake a pastoral visit to Transylvania, that was at the time without a Byzantine Catholic bishop due to the exile of Micu-Klein.

So Manuil Olshavskyi contested the authority of the Bishop of Eger and tried to persuade Empress Maria Theresa to give full independence to the eparchy.

[2] Among his most memorable works might be his Sermon et orientale de Sacra eccidentalem inter Unione quo ecclesia episcopus Rossensis.