OSLO (Reuters) - Norwegian oil producer Equinor has started a search for a new chief executive, the Stavanger Aftenblad newspaper reported on Friday, citing unnamed sources.CEO Eldar Saetre, 63, who led the company through the oil market's downturn in 2014-2016, has not set a date for his departure, but could step down in 2020, the newspaper reported."There is no date set for when he will retire beyond what was said in our annual report, which is that he would retire when he reaches the age of..