Yeah! That's exactly what I did a few days ago. If it is a leak it is a very tiny leak so I am not worried at the moment. When the time comes to do the TB, I will see what is up. BTW some guy on youtube used the old TB with a block of wood like a strap wrench to hold the cam gear still and got that nut off. Might try that if I decide to change the seals.Easiest: clean w/ brake cleaner, see if new oil develops