At the time of its introduction in 2001, the LB7 Duramax was considered the most advanced diesel engine to be used by any OEM in the light duty truck market. The revolutionary V8 diesel used aluminum cylinder heads and a common rail fuel injection system with a high pressure CP3 injection pump that made everyone a skeptic. While that LB7 platform was replaced with the LLY in the middle of 2004, the basic internal design of the Duramax has been left virtually unchanged up to the 2016 model year. Sure, it received some updates and changes as the years went on to better fit emissions requirements, but there is no doubt that the Duramax engine has been a homerun for GM. It’s an engine that is super reliable and fully capable of doing anything a truck owner needs, whether it’s used for towing construction equipment around all week or tearing up the drag strip on Friday nights. That being said, the LB7 isn’t without its faults. Since it was taken out of production more than 10 years ago and mileage just continues to increase, there are two main points an LB7 owner should prepare for: blown head gaskets and bad injectors. These are both relatively common problems you might expect to deal with on the 2001-2004 LB7 Duramax, but you can rest a bit easier knowing the aftermarket has had a decade to develop and perfect the parts you need to correct it. It’s now better than it was from GM.