i believe what happens is that lubricants have a flashpoint that they will ignite, pressure lowers that flashpoint, couple that with the heat of a flash fill, If the heat is the same as the flashpoint it go boom!
At least thats how i understand it although i have been wrong many times about lots of things
OK, I'm standing here with arms outstretched to my sides, palms up like a giant scale. In one hand a pile of Common Sense and Self Regulation,in the other a big bag of Nanny State, now which one is going to win??