I had a slow leak last year and replaced a couple of o-rings. Charged it up with the wally-world 134a (no stop leak) and seemed to hold. I am seeing bubbles in the sightglass near the battery tray so i want to get this taken care of for a road trip in july. I picked up a new dryer from c-dan, a manifold set from HF and a pneumatic vacuume from HF as well. So now i need some refrigerant, and oil i guess. Where would you reccomend getting the refrigerant, and should i get a 30lb tank like this A11 REFRIGERANT CATEGORIES FOR R11,R12, R22, R502, R134a, R113, R123, R409A, R408A, R500, R404A just in case i need to fix more leaks? Iis this all i need to do the job or am i missing something? thanks for any input.