Unless you are going to get PTFE under the olive - ie between the olive and the pipe, then I don't see why PTFE would help. I feel so many people think it is th esolution to everything - but without a proper side by side comparison of identical methods (with and without) then you don't know that it helped. PTFE is for threades joints - a compression uses the threads to compress the olive and are not part of the sealing process.