Duramax V8 engine, a turbocharged V-8 Diesel engine designed and built by General Motors
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Isuzu 6H Engine, a 6-cylinder commercial Diesel engine, re-branded "Duramax" for GM trucks
The Isuzu 6H is an inline-6 cylinder Diesel engine installed in Isuzu medium duty trucks, and also installed in GM medium-duty trucks as the Duramax LG4.
This engine family, designed by GM division Detroit Diesel, was produced by GM through 2000, when it was replaced by the new Duramax line.