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@DFP
any oil will have some lubricating qualities. WD40 and GT85 act as solvents stripping away factory dip grease. They evaporate quickly leaving a very light film, this is sufficent for lubricating a door hinge etc. But for a bicycle chain something a little denser is better.
If you look at stuff labelled 'chain oil' and 'chain wax' you will notice they are all a lot thicker than GT85 and wont evaporate.