Attention: TDR Forum Junkies What, if any, difference is there in the GL-5 gear lube as used in the truck differentials and the GL-5 sold for use in marine (outboard and I/O lower units) applications? I have a hard time finding synthetics here in Cedar City auto parts stores but Wal-Mart has Pennsoil synthetic marine gear case lube! Is it interchangable? (Is GL-5, GL-5 no matter what? Seems it should be) Also... . where in the area of Southern Utah is an Amsoil distributor?
