how do I know if motor oil was in my hair I walked under some stairs and felt a heavy feeling a little one on top of my head maybe motoroil?

My hair feel fine not like super greasy I took a shower I didn't use any shampoo but my hair feels fine but if it did how would I know I have motoroil in my hair even if it was the smallest drop.

?2016-10-27T23:45:59Z

Motor oil has a really strong smell so if there was a really strong smell it might have been that and you hair would feel greasy because it's very hard to get oil out of hair if it was motor oil you should use dish soap to get it out