Payday 2 is a shooter video game developed by Overskill software. It was published by 505 games on 13 august 2013 as a follow up of payday game. On day 2 of the payday2, it is essential to find out the right big oil engine. You have to get inside the house, find server room, find the laboratory door and then should go downstairs to the laboratory to find the correct engine. You can determine which engine to choose with this online calculator by choosing the tubes, gas and pressure.