PTFE for extruder barrel

Hello all,

From printing PET+ my PTFE tube in the extruder barrel wore out and i bought a new tube.
The thing is that now after putting the new tube printing the PET+ sometimes it extrudes with like pieces of the tube like its peeling the inside of it. I put some baby oil on the fillament and it has improved. The original seemed alot more robust, any suggestion on where to get some PTFE tube?

Thanks