Shell Rotella T6 Full Synthetic 15W 40 Diesel Engine Oil model gehl z17 8) Fins 7 13 16 (198 362 314 Width 11 8) Fins 7 13 16 (198 5 OD 1 (mm) 42 and other contaminants (compared to previous formulation) Increased shear stability for better viscosity control and optimal engine oil pressure Better cold cranking properties and low temperature pumpability for reaching critical engine parts faster Single 1 gallon bottle with ergonomic design for easy handling and pouring Advanced low ash formulation helps protect the exhaust catalysts and particulate filters found on the latest low emission vehicles and improves low temperature flow Exceptional wear protection for longer life in a wide range of heavy duty engine applications — from pickup trucks to tractors to semi rigs Enhanced fuel economy capability of 1