A new class action says GM uses low oil to deny Duramax engine claims. GM’s own 2024 and 2025 dealer bulletins show why a cracked oil cooler makes a neglected engine and a defective one look the same.

For most owners, General Motors' fix for a V8 that can chew through its own bearings came down to an oil change. It was a very particular oil change: 0W-40 instead of the factory 0W-20, a new oil fill ...

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GM’s new Duramax turbo-diesel 8.3-liter V-8 will go into the 2027 Chevrolet Silverado and GMC Sierra 2500/3500 pickup trucks. The new engine makes 555 horsepower and 1,230 pounds-feet of torque.

Evan Williams is an automotive journalist and mechanical engineering technologist with more than a decade of experience in the industry. He has written for the Toronto Star and AutoTrader Canada and ...

General Motors is in the midst of a full-bore revitalization effort when it comes to its truck line these days. In the last few weeks, GM has been rolling out details about its new 2027 Chevrolet ...

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The 2027 model year marks the newest "truck wars" for the Detroit automakers, this time with a focus on V-8 engines. General Motors is touting new and improved gas-powered engines as well as a ...

As GM Authority exclusively covered last week, the 2027 Chevy Silverado HD and 2027 GMC Sierra HD will introduce two new engines, including a new gasoline powerplant and a new Duramax diesel. The ...

Nearly one million GM truck and SUV owners are staring down a problem that should have been solved more than a year ago. On August 21, 2026, NHTSA's Office of Defects Investigation opened a fresh ...

The National Highway Traffic Safety Administration has escalated one of its investigations into General Motors vehicles for engine failure risks to include newer model years amid continuous consumer ...

Federal safety regulators escalated their investigation into General Motors' 6.2-liter L87 V8 on August 21, expanding a formal engineering analysis to cover an estimated 997,743 trucks and SUVs from ...