A 2025 GMC Sierra 3500 AT4 owner is reeling after his brand-new diesel dropped from 24 MPG highway to a measly 17 MPG, and ...

A GMC Sierra 1500 owner is stunned that his diesel truck delivers a "shockingly good" 23.5 MPG on logging roads, even with ...

MAHLE Lifecycle and Mobility has introduced comprehensive gasket coverage for Duramax L5P 6.6L and Subaru FA24F 2.4L engines.

General Motors and Allison Transmission share a long history, but that's all going to change at the end of this year. Here's ...

The affected trucks were repaired with a brake jumper wire harness devoid of protective tape. Notification letters will be ...

GM is taking the unprecedented step of removing some of the badging on its unsold trucks starting in 2026. Here's how GM ...

A lot of cost and a lot of chaos-that’s how Ford CEO Jim Farley summed up the current state of the US auto industry. The same turbulence now ripples into General Motors’ heavy-duty truck lineup, where ...

While the Duramax engine family has been around for a while, only the LBZ can truly claim to be the Holy Grail of GM's heavy ...

China is rapidly replacing its aging diesel trucks with electric models, signaling a major shift in the world’s largest ...

With four engines and a range of configurations, the 2026 Chevy Silverado 1500 offers competitive tow ratings, and now, GM Authority is taking a closer look.

SEMA 2025 is live in Las Vegas, showcasing the latest truck and diesel-performance parts, accessories, and innovations that ...

Tracking the state of the race between President Donald Trump and his Democratic rival Joe Biden, updated as polls are released. The NBC News National Polling Average is based on an unweighted average ...