how long are you planning to store these?? and is it 1 type or stacks of different oils??I tried saving syringes too,, because I never inject with the same tip that I draw from a vial with,, I always use a fresh tip ,, even if I store the prefilled syringe. I get a real sore site because I had stored 1 ml prop, and .75 ml of b12,, the test crashed ,, Fu@# did that site hurt for a few days..