I used to work in a UK supermarket (Morrisons) as a cafe cook, we had three separate large industrial frying machines, one for fries/chips/potato products only, one for fish fillets (that we dipped in gooey batter first) and one for meat (fatty sausages mostly) ..
Three different machines, three different cooks so we took it in turns to empty one of the fryers each morning at 7:00am dictated by paperwork stuck to a wall, the hardest one to clean before you re filled it with clean oil was by far the meat fryer .. someone tried to screw me over once, I was scheduled to clean one of the others but she told her friend to skip the meat fryer so I'd have to do it the next morning. I wasn't impressed, followed the paperwork and emptied a perfectly clean fryer and refilled it instead .. yeah I know .. who's going to play me in the movie?