The TPMS relearn process on the NBS Silverado's was actually a PIA for the first few years. There is actually a TSB on the relearn process because the air leaving the valve stem was causing irregluar vibrations that interfered with the sensor's transmitter (or something to the effect) . I did the relearn process on my 2007.5 1500 but I had to let the air out of the tire for 4-5 seconds almost exactly; if you let the air out until the horn honks (as indicated in the manual) you will have a flat tire before you ever hear the horn.
The oil change reminder reset is thru the DIC...pretty simple.
