Paul Shirley did a FB video not long ago where he was repairing a hinge that broke because it wasn't greased. He said the type of grease (food grade, automotive, etc) didn't matter as long as its is high temp grease. At this point I think it's a personal choice. I use high temp automotive grease and it's never been remotely close to getting on any food. The hinges don't take much grease.