December 2014  
Exciting News from Colonial Buick GMC
Vehicle Profile: 2015 GMC Sierra Denali HD
The best of the breed

Sitting at the top of the completely redesigned 2015 GMC Sierra Heavy Duty (HD) line of pickups available here at Colonial Buick GMC in Watertown, Massachusetts is the distinctive Sierra Denali HD, a truck the makes the most powerful Sierra HD ever also the most luxurious and sophisticated in the segment.
The 2015 GMC Sierra Denali HD builds on the bold exterior of the restyled Sierra HD with a signature Denali chrome grille; chrome belt moldings, mirror caps and door handles; body-color bumpers; a polished stainless steel exhaust outlet (gasoline-powered models); and available 20-inch polished aluminum wheels. The Denali HD also comes standard with projector headlamps and instantly recognizable LED daytime running lights, and it features added conveniences that include the exclusive CornerStep rear bumper and an EZ Lift and Lower locking tailgate.
Denali-specific touches inside include real aluminum trim throughout the cabin, “Denali” inscribed door sills and headrests, and soft-touch materials everywhere. There are Denali-exclusive perforated leather seats, and contrasting stitching gives the cabin added pop. In the Sierra Denali HD, a noticeably quiet cabin is another standard feature. The entire truck is built to reduce noise inside, using features like high-strength steel construction, inlaid doors, hydraulic body mounts and triple door seals that block outside noise. Cutting-edge connectivity inside includes the intuitive GMC IntelliLink infotainment system, five USB ports and an exclusive instrument gauge cluster that includes a reconfigurable eight-inch display screen. Even better, available OnStar offers 4G LTE and in-vehicle Wi-Fi that supports up to seven mobile devices.
Like the rest of the Sierra HD lineup, the 2015 GMC Sierra Denali HD offers 2500HD and 3500HD models (with or without dual rear wheels), and there are three engine choices. There’s a 6.0-liter Vortec V8 that delivers 360 hp and 380 lb/ft of torque, and it is also offered in a bi-fuel, compressed natural gas (CNG) configuration with 301 hp and 333 lb/ft of torque. The big daddy of the Sierra Denali HD lineup is a B20 biofuel-capable 6.6-liter Duramax turbo-diesel that’s good for 397 hp and an incredible 765 lb/ft of torque, and it is paired exclusively with a rugged Allison 1000 six-speed transmission.
These engines give the 2015 GMC Sierra Denali HD impressive towing abilities – up to 19,600 pounds with a conventional ball hitch and 23,200 pounds with a fifth-wheel or gooseneck hitch. Making towing even easier, the Sierra HD lineup offers StabiliTrak electronic stability control, Trailer Sway Control, enhanced cooling airflow, Auto Grade Braking and diesel exhaust braking, which help reduce wear on the brakes on steep grades.
GMC owners enjoy excellent peace of mind thanks to comprehensive GMC warranty coverage that includes a three-year/36,000-mile Bumper-to-Bumper Warranty, a five-year/100,000-mile Powertrain Warranty, five years/100,000 miles of Roadside Assistance and Courtesy Transportation, a six-month free OnStar trial, and GMC Pro Grade Protection, which provides two-years/24,000-miles of scheduled maintenance coverage for everything from oil changes and tire rotations to multipoint inspections and even diesel exhaust fluid refills on Duramax-powered models.
If you’re looking for the king of the road when it comes to capabilities and luxury, then look no further than the 2015 GMC Sierra Denali HD. Come by to see and drive the new Sierra Denali HD today.


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