UPDATE 1-Imperial Oil begins to accept proposals for Esso stations -sources
May 15, 2015 at 18:03 PM EDT
TORONTO/CALGARY, May 15 (Reuters) - Imperial Oil Ltd , Canada's No. 2 integrated oil producer and refiner, is accepting proposals from interested bidders for 500 of its remaining company-owned Esso retail sites, according to four sources familiar with the process.