Yes, Teflon is Dupont's trade mark name for PTFE, which some, not many, oil additive companys put in their additives. A quick google search will give you plenty of information on why teflon isn't good in a car engine.. mainly the fact it is a solid, even though it is ground up very fine, it is still quite able to clump and clog oil filters at best, but small oil pathways at worst.
Even Dupont refused to sell Teflon to Quaker State (Slick 50) to use in their oil additives as they knew it was bad and didn't want their name associated with it.. however, a court case initiated by Quaker State ended up forcing DuPont to sell PTFE to them.
Just about anyone who knows their oils well, will tell you to never use additives in engine oil.