This site, from the AutoZone car parts store, is geared mainly toward professional mechanics who want to buy repair information. Still, ALLDATA does offer some help for do-it-yourselfers. Browse TechTips written by ASE-certified master technicians and engine machinists (www.alldatadiy.com/techtips/index.html). For about $25 per year, you can buy a subscription to ALLDATA’s database of repair and diagnostic data covering more than 20,000 vehicles dating back to 1982.