1) The ability to be on time
2) Commitment and the ability to prioritize, most employers expect your work to take priority #2 right behind your family. For adults our work is part of supporting our family so priority #1 and #2 go hand and hand.
3) The ability to learn, most employers will tolerate mistakes but they are less tolerant of the same mistakes over and over and over again.
If you are a graduate of Father Guido's 5 minute university welcome back. I'll assume that you are still interested in automotive work experience, great! Before you go chasing those job leads below are a list of skills, abilities and general requirements you should have before you get started.
Work experience is an essential part of an automotive training experience. Think of learning a second language, you could sit in a Spanish class for an hour a day over a couple years and pick it up but what if you could sit in Spanish class for a couple of hours then go to Mexico for another 4 to 6 hours and live in the culture and get paid for it. That's kind of what a co-operative work experience is like. The major difference is you can probably be proficient speaking Spanish in a couple months to a year but any good auto mechanic will tell you they have spent their lifetime learning the trade. In fact if you aren't willing to work in the trade while you learn I would encourage you skip my class and take Father Guido Sarducci's 5 minute university below it's cheaper and won't waste as much of your time.