: Widely regarded as the best Duramax model because it was the last version produced before major emissions systems (like DEF) were added. It is paired with the highly robust six-speed Allison 1000 transmission.
: This is the top choice for a more modern used truck. It features a significantly strengthened block and a more reliable Denso HP4 fuel pump that fixed previous generation issues. best used diesel truck to buy
: Ranked as the most reliable modern light-duty diesel, offering impressive fuel economy (up to 33 mpg highway) and smooth operation for daily driving. Top 10 Most Reliable Diesel Trucks in North America : Widely regarded as the best Duramax model
: Often called the "holy grail" of modern Rams. It uses a robust common-rail fuel system but lacks the complex emissions hardware found in later 6.7L models. It features a significantly strengthened block and a
