Based on the race engine builder rule of thumb, any vis that gives you 10 psi (70kPa) oil pressure per 1000 revs will be fine for durability. So if 0W16 gives you 7-8 psi oil pressure at idle and 20 psi at 2000 revs on your hot days, should be fine.
I believe that old "rule of thumb" was specifically geared toward the SBC and was just a general guideline, I would certainly not be using it as a validation mechanism for deviating significantly from spec. Honda went with wider bearings and journals for example when they started going thinner, and this was discussed on here at some length a while back as the Japanese OEM's were the first to really chase the ultra-thin oil thing.
I would never want the following exchange to play-out as a result of advice received here:
Bob: Gee Fred, how'd you toss that rod through the side of the block?
Fred: Well you know Bob, I was on this message board and I was told as long as 0w-16 gave me 10psi per 1,000RPM, I'd be fine, so I put it in and I had 10psi at 1,000RPM so off I went. Engine started knocking after I ran it hard up an on-ramp and then we had a big 'ol cloud of smoke and here we are!
Bob: Doesn't your engine spec like 5w-40?
Fred: Yes, but these boys were really convincing, they really seemed know their stuff!
Bob: Are they going to be paying to fix this?
*crickets*