Something very weird is that, since the creation of the euro in 1999, the oil prices have revealed remarkably stable in that currency.
When the euro rates low compared to dollar, oil prices are low in dollar, when the euro rates high compared to the dollar, oil prices are high in dollar. If you see the euro reaching an all-time high, you can expect oil to do the same a bit later. If we believe that what was true in the past will be in the future, then we can expect oil rates to continue raising.
As a result, the volatility of oil prices turns out to be lower in euros than in dollars. For economists, that statement is rather counter intuitive considering that oil rates are determined in dollars, and the great advantage of this for the US is supposed to be a smaller volatily in oil prices. Obviously it doesn't work as it should, and I have no clue why.
Anyway, this phenomenon isn't unknown, many people realized this in the past. And if you check things in the details, you will realize that it's mostly oil producing countries which talk about priviledging the euro instead of the dollar. Venezuela and Iran wanted to sell their oil in euro, Russia increases its reserve in euro, Saudi Arabia considers pegging its currency to the euro. All these decisions come from the same observation, as oil prices are more stable in euros than in dollars, they would decrease volatily on their oil revenues in stabilizing their currency rates to the euro instead of the dollar.
I've made some internet researches on that phenomenon few years ago when I was writing my thesis on the euro, and I've never found an explanation of this which convinced me. Probably I should read a bit more on this topic today since I really find that curious.