It featured a 32-valve design with high-pressure common-rail direct injection and aluminum cylinder heads.

To meet this goal, they turned to a newly developed Garrett turbocharger with a variable geometry vane system and installed an EGR valve.

The LBZ is one of the more sought-after Duramax engines because of its strength, reliability, and being pre-emissions (DPF appeared on the next generation LMM in 2007).

[7] [8][9] Emission controls: Applications: The 6.6L Duramax diesel engine (VIN code "L") is used on 2010 interim and 2011 Chevrolet Express and GMC Savana vans and 2011 Chevrolet Silverado/GMC Sierra HD trucks with RPO ZW9 (chassis cabs or trucks with pickup box delete).

Similar to the LML, this engine also uses a DPF and DEF system to meet emissions standards.

The 6.6L RPO LML (VIN code "8") is the 2011–2016 version of the Isuzu/GM Duramax V8 diesel engine.

The engine gained new 29,000 PSI piezo injectors as well as a completely reworked fuel system which was now powered by the Bosch CP4 pump, that also now supports up to 20% biodiesel mixtures and a urea injection (to reduce nitrogen oxides) with a 5.3 gallon DEF tank.

[12] The L5D Duramax is a downrated version of the L5P for the Chevrolet Silverado MD and International CV trucks (Class 4, 5, and 6).