The people who own this garage are probably Mirpuri. Most people who come from pakistan to this country are mirpuri and they aren't very educated. Mirpur is an area in pakistan where people are from the hills, basically put they are - gypsies/ jungle people. However not everyone is like that, even within that community. There are many well established pakistani businesses, look at James Caan etc.
I guess any garage you go to you will get a gut feeling about the place and the people who run it.