I just found out that my case has a crack over one of the screw holes and I have a Spare motor with a good case. I wanna change it out to get rid of the oil leak proublem, but I dont know how much oil to put back in. I have 2 stroke engine oil from wal mart and thats what I use to mix with my gas. Would that work in the base too? The jug says (2 stroke Engine Oil)