Plans to build a new 4.5L Duramax light-duty turbodiesel for General Motors’ full-size pickups have been indefinitely suspended, according to Ward’s Automotive Reports. The advanced turbocharged V8 had been in the works for over three years and was scheduled to be offered as an option on 2010 Chevrolet Silverado and GMC Sierra trucks.

The OEM cited an extensive product review conducted as part of long-term viability plans and current economic conditions as reasons for halting the diesel project. “GM remains optimistic that the Duramax 4.5L V8 diesel may be a viable option in its future portfolio,” the company said in a statement quoted by Ward’s.

The small diesel was scheduled to begin production later this year at GM’s Tonawanda, NY, plant. The suspension does not affect the larger 6.6L Duramax turbodiesel currently offered in GM’s heavy pickups.