1999 Sterling Truck LT8513 Engine: 7.2L L6 DIESEL; Position: Lower - Engine To Pipe;. 2000 Sterling Truck LT8513 Engine: 7.2L L6 DIESEL; Position: Lower - Engine To Pipe;. 2001 Sterling Truck LT8513 Engine: 7.2L L6 DIESEL; Position: Lower - Engine To Pipe;.