2w, 3w, 7.5w.... are just ways to force you to buy whatever they want, or a way to differentiate a product.
0w50:
Mobil1, Klotz,Eneos
5w50:
Castrol, Mobil1, Redline, Motorcraft, Motul, Pennzoil, Maxum, Torco...
And, there are various 10w50's out there too. Unless its the cold of an Alaskan, Canadian, or mountain range winter, you don't need a 0w or 5w.
Most 50 weights with that wide of a spread will shear into a 40wt. I wouldn't have problem running 0w40's or 5w40's in northern climates. And, 15w50/20w50/10w60's in southern climates would be fine too. Just stick with a full synthetic for 'temp' concerns.
2w50: Obviously they want thick viscosity. Sump size or oil cooling might be deficient. They want a full synthetic since you won't get a spread like that without it. Pseudo 2w is for those cold starts. If you use a 5w or 10w oil, give it a couple minutes to warm up before abuse.
A VOA would be interesting.
Tracing out the oiling, cooling, and filtration systems would be a good start. Something is lacking.