I’ve got 50 wt Lucas in mine right now. I ran it in my old bike even in the winter but haven’t run it in my current bike in cold weather. I put it in at the 1k back in September but switched to Mobil 1 in November when the temps started dropping into the 30s. It wasn’t giving me any problems but I just got paranoid. I actually like that oil very well which is why I went back to it when the weather got hot. It definitely seems to run cooler on those 90 degree days. Quiet too and the bike uses less oil. I will follow this thread because I really want to stick with the Lucas year round but I ride in some mighty cold weather. I know straight weight full synthetic flows better cold than dino does but how much better I don’t know. Lucas doesn’t publish their pour point but sae 60 Amsoil is -36 C so I’m thinking the Lucas 50 should do just fine in Ohio winters as long as I let it warm up real good. But to answer your question I run sae 50 Lucas because I trust it to keep my motor cool when it’s 93 degrees and I’m creeping along in stop and go traffic. I have had bad experiences with a couple of other 20w50 oils in those conditions.