u/Juanizzle-1226

I just got into car maintenance and I’m wondering what things I can do by myself maintenance wise that can save me money. I just learned how to change my oil like 2 weeks ago. A friend told me I can change the air filter by myself, and then he said those 2 things are the only things I can do… is he right? 2006 Toyota Corolla S is the car I own.