With regard to oil level checks, i just found out that there is a check that works for me when the engine is running on flat ground on the centre stand.
the oil is at the low level mark if it is running and rises slowly to the top mark when stopped, this could be a double check
when over filled and above the window, but by how much?
If you run the engine and the level becomes visible you should be ok.
Maybe i'm to fussy but here goes; link to youtube;
https://youtu.be/mEgQmyknW_4
All the best; Max