Working for GDI at the Irving Oil Refinery has been a decent experience. We work 7-4 Monday to Friday with weekends off and opportunities for over time. Sometimes we get cake. but the Manager of day shift is not worth working for. the job is simple, the people are easy to get along with, but the management is on a huge power trip and does not do her job. She expects you to do her job. A lot of drama, nit picking, favoritism, and stress. You walk through the gates and you instantly feel sick.