D.D.
C. - not sure if you want to travel to Ecourse but I can highly recommend P&J Auto aka Felps Auto ###-###-#### on Southfield Road. I am biased because my husband works there (almost 15 years) and they have a regular customer base that has been coming back year after year. They also service the Ecourse police vehicles.
Good luck - I know it's not easy to find a reliable and trustworthy mechanic.