Got a Predator 71100 and I have questions

Just took it out of the box, read the directions. It doesn’t list oil capacity for the engine. Also, do I have to run anything through the washing fluid tank in order to use it?

I think that is a homeowner unit, just so you know this is a professional forum. When in doubt rinse it out. Looks like you bought a cheap chinese unit and it it didn’t come with instructions? Shocking.

here is a link to your manual