How to Change Your Car Oil — Step by Step is a three-part field manual for one of the most important tasks in car care. It begins with setup and safety, showing you how to prepare your workspace, gather the correct tools, and raise your car securely. It explains why clean oil matters and how to select the right oil and filter for your vehicle. The guide then moves into execution and testing, where you drain the old oil, replace the filter, torque the plug with a new washer, refill with the correct amount, and verify your work with dipstick checks and leak scans. Each step is written in plain, calm language designed for first-time DIYers. Finally, the book covers troubleshooting and maintenance. You’ll learn to spot leaks, correct common mistakes, dispose of oil and filters the right way, and keep accurate logs of each service. With habits like monthly dipstick checks and proper documentation, you can extend the life of your car and avoid expensive repairs. This guide gives you more than instructions — it builds a routine. By following it, you’ll save money, protect your engine, and gain confidence in your ability to handle basic car maintenance safely and responsibly.