Originally Posted By: tc1446
Seems unusual that the FAA approved its use in aircraft motors where it has been used for a long time. Whether its beneficial or not, I have no idea, but I would believe that if it has had any harmful effect they would have come to light by now. I know a few pilots who have used it regularly.
Say what you want about it, I have personally seen some amazing pistons out of a Lycoming aircraft engine rebuilt at my BIL's shop. Truly clean pistons and rings like a 20k mile car engine in a motor with a couple thousand hours on it! The guy was an old pilot who used it in his planes.
Zmax actually prevailed in their FCC lawsuit, the product does some things very well despite the hoo-hah.