GM decided to postpone its more fuel-efficient Duramax 4.5-liter V-8 diesel engine. It had planned on offering the engine on the 2010 Chevrolet Silverado and GMC Sierra light-duty trucks. The company cites the current economic climate as reason for the delay.
Initial estimates said that the light duty diesel would obtain 25% fuel economy (compared to a similar sized gas engine) while delivering 310 horsepower and 525 lb-ft feet of torque. The new engines would also cut cost and weight due to their innovative design.
The company says that it remains optimistic that the engine will be a viable option in its future portfolio. In the meantime, in order to obtain a diesel-powered Silverado or Sierra, customers must order the heavy duty 2500 or 3500 series truck with the larger Duramax 6.6-liter V-8 diesel engine.