I got a spare Decking Board, and brought 1/2 a dozen "test pots" of different Oils,
And I taped it into sections with Masking tape (400mm apart)
and I oiled 1/2 of each of those sections with a range of different oils/tints,
And left it outside to 'weather' to see which ones looked best, and had the look I was after.
(I was hoping to have the grains/colours show through the oil I used.)
This exercise is well worth doing, before you commit to an Oil/tint.