My wife and I found this little kitten yesterday evening on the way home. We heard her meow and found her under an old car near our building. There was no one around and it was raining a lot. She was all wet from rain mixed with car oil so we took her home. We had to search online about how to wash up that oil from her. Luckily there are a lot of posts online about how to solve this problem (it really surprised me when I found out that things like that happen a lot not just to cats, but to dogs as well).
Rumi was a little bit confused when he first saw her, but I'm happy to say that he accepted her very fast :)