[Funny]

That is why i use the odd/unusual/strange changing interval, because of my previous work on engines.
I know that the majority of engine wear is in the first few hours of run-time on an engine, therefore I change out the oil that is getting filled with particulates. Then I go a little longer with a controlled particulate (Marvel Mystery Oil) to smooth the surfaces. Then I let nature take back over, but still change the oil more frequently to get the remaining majority of fillings out of the crankcase. Then regular oil changes with a good filter and good oil.

It just seemed logical to me, so that's why I did it that way.