I have probably 8 gallons of Delo I bought within the last 2 months from the local Auto Zone. I didn't notice till I was at TSC the other night and was going to by the DELO they had there was a date that said 02/17/09. So I checked the jugs I had at home the 1 gallon jugs are from 02/20/13 and the 5 gallon bucket is from FEB 2014. Would this be okay to run or is it bad and I wasted $130 in oil.