After cleaning the teak either by sanding or using one of the commercial two part cleaners I have tried several teak oils. All looked beautiful at first but even with repeated regular applications, ended up looking pretty bad by season end. A few years ago I switched to Cetol-marine. This pigments the teak a little and leaves a hard varnish like finish but it is durable and lasts. I typically get 2 or 3 seasons now before I hae to recoat.