Since I purchase in bulk.....I will supplement my Vehicle Maintenance Log with a digital photo of the oil, oil filter, license plate, odometer and calendar. Hopefully, include all the above in two photos that I will print and file in my log. In the future, I don't ever want any debate with a manufacturer over the maintenance on a warranty item.
If nothing else, the photos ought to make for some fun conversation when my grandchildren are in their 40's.....discussing the hassles of plugging in their electric cars!!!!