I have used Osmo Teak Oil on a Bangkirai deck for two years on a new deck. The result was very nice, but it took only 4 weeks before the grey started coming out again. Both years I have applied two coats and weather conditions were average for Germany, but the only space the wet look is still intact is underneath a ceiling. I should mention that you have to sand down the Osmo where it is still in tact, but you can brush/ polish off the grey where it is deteriorated.
I am in the middle of another try with a Bangkirai Deck Oil from natural-farben.de. It's supposed to go deeper than the Osmo and keep the wood breathable. At the same time it has more pigment against the sun/ grey effect. The Osmo seems not to go that deep and looks more like lacquer than oil finish.
As soon as I have applied the new oil I will post my experience. Unfortunately weather conditions are just not in favour of my project.