Yeah, Im at 134000 and have a small leak I traced to the left lower radiator. It was hard to find, because the fan blew it all around. Its either the LL corner of the radiator or the petcock valve.
I am losing about 1 cup per week of fluid. I replaced the petcock today with 61125 (see below), as I saw seepage and drips there. I hope it works, but if not, pressure test this week and could be a radiator or water pump. Checked all the hoses and no leaks there. Its also interesting to note that it does not leak unless its driven over 5 miles or so, eg the leak doesnt happen when it sits, so keep that in mind, or you may drive yourself crazy.
IMPORTANT!
Autozone, Dorman and Amazon all say part 61136 fits.
IT DOES NOT FIT. At least not a 2007 SR5 V6 4x4. WTF?! Ignore their recommendation. Had to run back to the store and return the wrong one after I opened the drain, found it to not fit, then refilled again.
I bought this one
here despite warnings that it does not fit.
BUT DORMAN 61125 FITS PERFECTLY. Other option would be to try just replacing the oring, which Im sure you could do if you had a second vehicle and were willing to do a full drain and refill.
Well see if it fixes long term, but for those who see seepage there, get Dorman 61125. Will update as the week goes on.