The fourth edition saw an extensive revision. The textbook now has over 700 illustrations, including information about autonomous and electric vehicles. This latest edition of Auto Upkeep addresses exciting breakthroughs in the automotive industry.
Our second edition came a few years later with the addition of 5 new chapters. Our first print run jumped to 10,000 copies. To offer more choices, we offered both paperback and hardcover options. We also released a workbook to support the textbook. Expanding into the homeschool community, we developed a Homeschool Curriculum Kit.