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IIRC, Valvoline, no longer part of Ashland, has no refining operations, they are strictly a blender at this juncture from what I recall.
This is probably the most correct answer. Having worked for Ashland since 1973, then Marathon Ashland Petroleum, then finally for Marathon after the total buyout, I can tell you this much:
When I applied for my job, I had to go to Freedom, Pennsylvania. This WAS a refinery at that time, and all Valvoline products, including Tectyl were made there and were refined from pure Pennsylvania crude oil.
There was a personal commitment from every single worker at that time to put the best oils out that could possibly achieved with that technology.
I think that commitment exists to this day! However, Marathon DOES have refineries, and those blend stocks would generally be sold to Valvoline for making lubricants, as well as other sources.
Bullwinkle, those barges are likely carrying light products. Huge market in Cincinnati.