I stopded using teflon tape and any paste type pipe sealent several years ago. The systems on our trucks and other vehicals are just to important to trust to teflon tape. Oil systems and high pressure fuel injection systems are to expensive and sensitive to risk a piece of debra (tape) gettting in and ruining something. I have been using , with great sucsess, Blue LockTite. It sets up quick and has nothing to harm sensitive systems. I also manufacturere and sell High Performance Transmission coolers, and have never had a leaker, something un-heard of in the old Teflon Tape aera.