Chevy/GMC

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Pure Diesel Power carries a vast selection of replacement parts, performance parts, and accessories for the 6.5L Turbo Diesel found in 1992-2000 GM truck applications, along with top-knotch products for your 2001+ GM truck equipped with the strong-running 6.6L Duramax diesel engines.

Not sure which Duramax Diesel you have?
If your 8th digit in the VIN number is a 1, you have a LB7, if its a 2 or 3, you have a LLY, if it is a D, you have a LBZ.
LMM engines are only found in the new 2007.5+ GMT900 new body style trucks.
2011+ trucks run the LML engine, which features DEF.