heat the amp first
and if you must, draw up with a 18 gauge, or as i do, remove the plunger, pour the oil in, take the other amp and do the same. After that you pour the rest of the first amp in it, then the second, so you will not waste anything. Hold the plunger to the syringe, do NOT push it in. Turn it around, remove needle and cap and push the plunger in.