First of the Pope is not holy at all. He as all Pope's that claim to be a Vica of Christ only serves him to be as the Bible says an anti-christ. Don't get into a Bible debate with me that you can never win.Actually I probably KNOW more about engine oils than 75% of the forum members all added tgether
20W 50 is a 20 weight oil at room temperature which thins down to the equivalent of a strait 50 wt oil at operating temperature which is around 100C depending upon which set of standards you are using
Thus at room temperature the 30 is thicker and at operating temperature the 30 is thinner.
Now if you had a quality mower with an Eatons transmission which uses hydro oil your silly mistake would be a problem that requires one if not 2 or 3 oil changes as hydraulic oils & engine oils do not mix and may form an emulsion which is not good.
You gat a perfectly sound answer then came back demanding more
So you got more
As your seem to begging for some sort of punishment then the self inflicted punishment of some orders of monks to cleanse their souls would appear to be appropriate
Oh and engine oils go up to SAE 90.
Harley oil is SAE 75W 90 for the older bikes
BP still make ther monogrades 10 centipoise incriments from SAE 10 up to SAE 90 usually labled "Coarse XY" . They used to have a coarse 100 & coarse 120 but I have not seen that for 15 ish years
I use Coarse 50 & Coarse 90 it in some of my veteran total loss engines
Hence the supposedly humourous 20.05W 49.05 allowing for the dilution factor .
And I do not pretend to be holier than the Pope.
If I was a pervert then I would have suggested you make a video of you doing it .
By the way, check this chart out below as Sae30HD is even thicker than all these on the list.