Since launching in 1992 as a replacement for the 6.2 diesel V8, the 6.5-liter GM Detroit diesel engine has had good years and bad years, and opinions on its merits have been just as mixed. Some view ...
When the off-road focused Sierra AT4X debuted, it was equipped with just a single engine option: GMC's premier 420-hp, 6.2-liter V-8. However, since the introduction of the rugged AT4 trim in 2019 ...
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