Maintenance of Harvester gas engine range extender

[Macallan 18]

We don't know which VW engine will be used as the Harvester gas range extender yet, but I assume it will be a simpler and smaller engine.

I'm curious what maintenance we'll need to do on the Harvester -- will it be the typical oil change interval for that engine or something different.

Also, with its special placement it'll be interesting to see where to fill and drain the engine oil.