1. (someone whose occupation is repairing and maintaining automobiles)
automobile mechanic, auto-mechanic, car-mechanic, mechanic, grease monkey
synonim: mechanik samochodowy

2. (someone who drives (or travels in) an automobile)
motorist, automobilist: :

3. (someone who drives racing cars at high speeds)
racer, race driver, automobile driver: : synonim: automobilista

MOTORIST