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To accommodate this big power increase, the block, rods, pistons, and main bearing were all strengthened. The LML Duramax featured a huge leap in performance from the previous engine to put out almost 400 horsepower stock and 765 pound-feet of torque. The good news is that this engine is otherwise the same as the LBZ and features plenty of power and reliability. Fuel economy was also lower in this engine as the exhaust treatment uses fuel to work. All three of these parts are known to be failure points in this engine. These devices include a diesel particulate filter (DPF), an oxidation catalyst, and a new EGR. Moving into the emissions era of Duramax, the LMM was almost exactly the same as the LBZ, except it featured several new emissions control devices.

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However, this isn’t usually an issue for most owners as it takes some $20,000 in mods to get to that level and isn’t necessary for most applications. The only weakness is that the pistons are known to crack if you get over 600 horsepower output. Built stronger and more durable than previous engines, the LBZ is reliable and powerful. It has the best potential for performance and horsepower additions through various Duramax parts mods and tuning. Still lacking emissions control devices, the LBZ is also one of the most popular Duramax engines. If the LLY’s run was short, the run of the LBZ was even shorter. The good news is that head gaskets are easy and cheap to fix compared to bad injectors. In terms of weaknesses, the LLY traded the injector issues for overheating issues related to heavy-towing and blown head gaskets. The LLY is capable of getting the largest amount of additional horsepower from tuning only versus any other Duramax engine except the most recent model in the L5P. One of the shortest-lived Duramax engines, the LLY is very similar to the LB7 in structure, parts, and the lack of emissions control. If you’re looking at one now, there’s a good chance that any weak or failing parts have already been replaced. The good news is that modern Duramax diesel parts can easily resolve most of the old issues with the LB7. In most cases, this issue requires injector replacement.

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The one weak point with the LB7 is cracked or leaky injectors. The block of the LB7 is rock-solid and so are most of the internals.

Modern Duramax engines often have issues with emissions devices, which don‘t typically last very long. The lack of these extra emissions parts made the engines highly reliable.

Other than LB7 engines sold in California, these engines didn’t include any emission control devices. It’s still highly popular in the used market. The LB7 is the original Duramax engine that arrived in 2001.

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On the other hand, the more modern engines add more horsepower, torque, and upgrade capability with Duramax performance parts. For example, the pre-emissions Duramax engines made between 20 are highly sought-after for superior reliability. Some engines are more popular than others. Every variant of the Duramax engine has its strong points and at least one weak point. Before we can draw a conclusion on which Duramax engine is the best, it’s necessary to discuss the different engines and the pros and cons of each.

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