Servicing intervals are usually specified using kilometrage, years, or a combination of both. For example my motorbike has servicing intervals every 1000/12000/24000/36000/48000/etc. months xor 6/12/24/36/48/etc. months, where xor means either one or the other measurement is to be used depending on which falls earlier.
Since I have more than one vehicle, I am having a hard time tracking down when I did what servicing on my vehicles. I am having an even more hard time remembering when I should service them next. The issue here is that not all manufacturers use similar servicing intervals.
So here is the question. Is there an efficient way to keep track of what was done on each vehicle, and when the next servicing interval falls? Ideally I am looking for a smart solution that is easy to upkeep.