Last August I bought a brand new 2011 GMC Sierra 1500 CC SLE with the 5.3L. Around 4,000 miles I took it in for an oil change at a local place before a 6 hour trip out of state, no big deal. A few months later, I believe closer to 9,000 miles, I took my truck to a dealer for an oil change, I had a card for a free oil change w/ the time to kill. Well not long after their oil change, I noticed my oil pressure gauge was reading out of the norm (i.e 35psi at cold start, right under 40psi accelerating, and at 20psi when stopped with engine warmed up). I contacted the dealership and they said it didnt sound like a problem, but would gladly check it out. Come to find out, my oil pump was weak and their was "trash" in the line. Oil pump, pressure relief valve, and oil all replaced. My truck was brought in because my gauge was out of the norm, and a problem was located. The problem was "fixed" and verified with a mechanical gauge, yet my dash gauge still reads out of the norm. Does anyone else have or had this issue and how was it resolved if so? Also when I say norm, I am referring to the dash gauge showing more towards the 40psi mark. I refer to this as the norm because that is what the gauge showed until approximately 9,600 when it dropped and an issue was located. My cluster all shows to be working fine, and the repairs were covered under warranty.