Back in the 60's when teak veneered furniture was all the rage many people used to slap teak oil on thinking it was doing some good the fact that most of the furniture was finished in polyurethane varnish on which teak oil makes no difference.

Before you start slapping oils on your furniture check what it already is finished with as you may just be wasting your time. If it has been finished with a varnish I would think twice before you attempt to remove it to get back to bare wood due to surface impregnation you may find yourself sanding right through the veneer.

Richard