How does Oil of Luck actually work? You can often try one item 20 times and nothing, the other one gets it for 1 time. Someone on the forum said, at least that's what I understood, that the item dropped from the monster has already been saved whether the lucky bonus will be successful or not. If it works like that, what's the difference between a 20% oil and a 40% oil?
I have amulets where you can sit all day and nothing. RW in jared stone managed to connect with Oil of Jonjuration only after the fifth jared stone, in the previous four it was impossible.