Enhancing performance of the 6.6L Duramax L5P diesel engine that powers '17-to-current GMC and Chevrolet trucks is not an easy proposition. General Motors' calibration engineers have made it very ...

Known under the VIN code Y, the L5P Duramax is the latest evolution of the 6.6-liter turbo diesel that powers the Silverado HD and Sierra HD. Introduced for the 2017 model year and mated exclusively ...

The GM L5P Duramax is a turbo-diesel engine produced by General Motors for use in full-size heavy-duty (HD) pickup trucks. Displacing 6.6 liters in a V-8 configuration, the L5P is part of a new ...

After Ford announced the all-new F-Series Super Duty for the model year 2017, General Motors and Fiat Chrysler got left behind big time. Whereas Ram Truck still has a long way to go until it updates ...

The 2017 GMC Sierra Denali 2500 HD is like an old friend that’s picked up a weight lifting hobby since you’ve seen them last. Largely looks the same, but there’s a mild hint of added fitness to their ...