If my silencer has excessive oil coming from between the end cap and the body of the silencer, does that mean that I need to repack it? I don't have any problems with my quad running bad or anything like that. I just figured that was the problem.

 

You're running too rich, or unburned oil wouldn't even be making it to the silencer to begin with. It may be just because the oil injection system puts such a rich oil mixture into it compared to what most guys run on premix. The packing really wouldn't have anything to do with it, the main function of packing is to keep the noise levels down.