The D1010D is a diesel engine manufactured by GM International, which is the commercial engine division of the General Motors Corporation. The engine is an 8.1 liter (496 CID) V8 that was specially designed for medium-duty truck applications. It also features advanced features such as a carburetor-style throttle body, direct fuel injection, and electronic fuel rail control. The engine is powerful and reliable, while still being fuel-efficient and emitting low levels of emissions.