8. ANY changes to the car
Car lovers like working on their four-wheeled pets, but you have to be careful, and notify your insurer about any and all changes you made to your car. If you change the engine or lower the suspension, you have to tell them. Also, be careful of small things that most of us forget, which can get your insurance invalidated. Those are usually anything from stickers, tinted windows, new wheels and custom paint jobs.