I decided to place this in the Studebaker section because, quite frankly, there is no issue about which we have more Turning Wheels Co-Operator correspondence than problems with contemporary gasoline, especially the E-10 that seems to be just about all that's available. (Many forum members do not access Stove-Huggers on a regular basis -if at all- and would miss this if it was posted there.)
From The Historic Vehicle Association's current monthly e-mail newsletter:
https://www.historicvehicle.org/Lates...n-on-a-mission
Note that writer Ed Syrocki recommends the following Schaeffer Oil gasoline additive. I've long known about Schaeffer Oil (good products; much experience), but had not heard of this specific additive. I intend to buy and try some; sounds like a good idea.
https://www.schaefferoil.com/soy-gasoline-additive.html
'No need for us to get off on our usual "discussion" of ethanol-enhanced gasoline; it just isn't as good for our older, non-FI engines as was the gasoline available when they were new.
Further, I've had hours-long discussions with my freind of many decades, Ron Hewitt, who owns and operates Daytona Parts Company in New Smyrna Beach FL. Ron and his son have been rebuilding collector-car carburetors and supplying parts for same for at least 20-odd years now. The stories he tells of late about carburetors damaged by E-10 are both enlightening and frightening. Ron echos what Mr. Syrocki reports in the linked article from The Historic Vehicle Association, and I dare say they know more about this than any one here on the forum...probably most than all of us combined, actually! <GGG>.
Forewarned is forearmed and all that. BP