title_body: Should I flush the Nuova Simonelli Oscar II before pulling a shot?
upvoted_answer: Flushing helps clear any residue that might be left inside the machine or grinds stuck to the group screen before pulling your next shot. It also helps bring the group head up to temp before you lock the portafilter, so your first bit of hot water doesn't get cold as soon as it hits your puck.