Whether to trust or not is entirely up to you, but why do you bother participating in a User Forum if you are not interested in learning the opinions of others?
Have a better day.
HTH
Difference between dip sticks was due to the presence/absence of an oil cooler above the oil filter housing.
My understanding is the dip stick with the dot was for engines with the oil cooler above the filter housing - no dot was for engines without the oil cooler above the filter housing...
I'd feel a lot better about your test if you added a "flush" 500 mile oil change after dumping the Marvel Mystery Oil:
4,500 mile 0w-20 Blackstone Report should be received this week
5,000 mile 0w-20 w/ 1qt Marvel Mytery Oil swapped in @ 4,500 miles being mailed to Blackstone today
Changed to...
I jumped to 5W-30 because Toyota doesn't recommend 0W-30 for use anywhere.
Here's the chart most reference when talking about oil recommendations for ROW applications:
My read on this is that 0W-20, 5W-20, and 5W-30 are OK for general use anywhere colder temperatures may be experienced...