Theres no harm in useing a gasket on the oil return pipe id say its better to. Dont use one between the turbo and the swan neck part of the manifold but make shore the to surfaces are clean and smooth scotch bright is good for this! The banjo bolts will need sealing washers i used dowghty washers (not shore if thats spell right lol) there cooper washers with a rubber middle but normal cooper ones are ok