After 12 years working as an engineer for a Fortune 500 company, I quit my management job to become an auto mechanic. I traded high heels and an air-conditioned office for boots, Dickies and grime-covered hands. The reason was simple: I was tired of feeling like an auto airhead and getting scammed by the male-dominated car-care industry. Like many women, I felt dread each time my car’s odometer crept toward the next 3,000-mile interval. An oil change never meant just an oil change.