I used a small line for mine, don't remember which one though. Sucked the can up pretty fast with no drama, and very little smoke. I thought it had failed. I shut the car off for 15 minutes, and then started it up. It was then I knew the stuff did something. I had to fight the car to get it started, then I had to fight my neighbors off because I was smoking them out. Did I mention traffic was getting upset because I was smoking up a storm? My car really needed it when I did it.