I don't know about the oil. That left handed zipper is a European thing. You know, they do drive on the wrong side of the road? At least that is my American view of the problem!
For what it is worth, my BMW (MEN'S) jacket has a left handed European/woman's zipper also. Like you, it was awkward for me in the beginning. After a while, you get use to it. And when the zipper is covered up, the jacket still looks manly.
You have a good day,