Have 13K on the 07 UC. Added V&H slip ons, Power Commander, K&N High Flow filter. Using Amsoil 20W-50 in all of the holes and never have had any problems. I don't understand this 5th gear noise that everyone talks about, not on mine. Of course I hate the heat, but using the syn oil dropped my oil temp from 238 to about 220. Had a oil cooler on that dropped it another 10 to 15 degrees, but had to take it off because it was hitting the fender.