While 40-year-old engines might not be expected to be the most reliable today, a certain diesel engine has found itself with an incredible reputation.
The 11.9-liter QSX11.9 and 15-liter QSX15 Heavy-Duty engines are supplied as fully integrated air-intake-to-exhaust aftertreatment systems to meet 2011 EPA Tier IV Interim/EU Stage IIIB regulations.
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