> Do you think its really possible to do an oil change in 10 min?

It's kind of short timing, but if they were in a hurry to finish and get out of there, they could do it it ten minutes.


You didn't say what engine you have. If you have a dipstick, you could check the oil with a white paper towel and tell by the color if it was new oil, since oil tends to darken rather quickly.