Whether you own a fleet of vehicles or just want to keep your car in top shape, you should have a log book service completed at least every two years. Your car's manufacturer may require you to have your log book serviced regularly. Your mechanic can complete this for you, or they can follow the manufacturers specifications. Log book servicing is an essential part of maintaining your car's warranty and keeping your car running smoothly. If you are unsure of the requirements for servicing your log book, check with the manufacturer's website.