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I think GM will build their on in house Diesel. I'm sure after using the awesome Duramax by Isuzu GM knows how to design and build another awesome Diesel. I believe the new 4.5 Diesel is GM design and build if so thats going to be the test Diesel engine. I don't know any of the above to be true or not just my opinion. But GM has some big shoes to fill to beat the Duramax. GBY....
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