Discover the surprising Japanese roots of GM's popular Duramax diesel engine, a powerhouse for US pickup trucks since 2001.

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

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

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 ...