It's 2 1/2 years since this was last reviewed, and over 8 years since it was started, and any finish left in full sun for that time will be showing severe deterioration by now. Only the Sikkens shows any signs of giving continued protection. The Osmo UV Oil has all but disappeared.
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The back of the test piece is in permanent shade and both the UV Oil and the Sikkens continue to give protection, although I question whether a product called UV Oil is correctly named if it only provides protection when shielded from UV.
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This is of course only relevant to this particular product, and I remain a fan of Osmo Polyx oil, Osmo Raw and Osmo TopOil for protecting interior surfaces. I'm tempted to retire this particular test now as I think it has run its' course, but the more comprehensive test is still ongoing
here.