fill. close. start engine , turn lock to lock, pausing for 2 seconds or so. Check and re-fill.

the  420a can go a long way if its properly maintained.

Manual transmission swaps can be done for 100 bucks not counting the transmission itself. Some of that cost can be offset from selling your old AT items.

There is a problem with it. Most people dont notice it till the "IDIOT" low oil pressure light comes on.
If you have an aftermarket oil pressure gauge and no windage tray its clear when you corner.

Its usually  a problem for people that dont keep an eye on their cars. Low oil would mean its even worse.

If your car doesnt leak that bad and you dont take corners at 60mph, you probably have not noticed it.