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Class C 4x4 RV with diesel engine in Arizona

Ad says

1994 Gulfstream, 24 ft Class C
diesel 4x4, 18 MPG 70k miles
$12,400

The RV is built on a Chevy pickup chassis rather
than a van cutaway chassis.

The ad claims the engine is a Detroit Diesel,
but there's no way! It's likely to be a GM
6.5L diesel.
 
The ad claims the engine is a Detroit Diesel,
but there's no way! It's likely to be a GM
6.5L diesel.

Ad is correct, and you are correct. That family of engines was designed by Detroit Diesel, a subsidiary of GM. The Duramax, a much newer engine, was designed by Isuzu.
 

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