I have a 2010 2500HD Chevy with the 6.0 and 3.73 gears 4x4. The truck and powertrain are solid. I have 113,000 miles on her and she was exactly 9 years old on March 1st. Never had any oil in it except Mobile 1. Change tranny fluid every 50,000 miles with Valvolene which is a full synthetic and not a belend. Engine likes to rev and drank gas. My only regret is that it came with a 26 gallon gas tank. When she gets to 1/2 I start looking for a gas station. One time while pulling my camper down I-85 between Auburn and Montgomery I put 26.2 gallons in it! I was really running on fumes. Miles remaining said 25!