I have a recurring annual calendar event setup for the first Saturday in December (one for my Jeep and another for my girlfriend's Merc). In those recurring events I just have a list of the common maintenance items and, whenever I perform something, I add a note (e.g. "Changed oil on 1.7.16, ~116.4k miles"). Mainly, these recurring calendar events serve the following purposes:
- Provide quick reference for the last time XYZ service was performed and keep tabs on any developing issues (e.g. slight play developing in ball joints, DS flex discs cracking).
- Remind me to go through the records for our vehicles at least once per year and schedule any upcoming maintenance.
- Share this information with my girlfriend so she's in the loop too.
- Serve as a reminder to prepare our vehicles for winter (e.g. put chains and ice scrapers into vehicles and get them up to date for trips to Tahoe).
- Provide access to this information in a concise format from anywhere since I can pull it up on my phone.
Whenever a service is performed, I take the printed copy and put it into a manila file folder so we have it documented. If I perform the work myself, I print out a copy of the order (I buy a lot of my parts online) and then I write on it the date the part was installed along with the mileage and store it in the same file folder. I like the hard copy version because, when I go to sell a vehicle, I can just hand the new owner the folder and they should have everything that they need.