You are very observant....I checked the capstan oil can tonight and there is indeed a Willys label applied over another label.
I didn't want to peel the Willys label off entirely, but I was able to carefully peel back a small portion of the bottom of the label (the part just over the word "Newark"). I found the word "Fiske", but that was all I could find without further damaging the Willys label.
Using Google, I searched the word Fiske and oil and found a company called Fiske Brothers Refining Company, which has HQ's in Newark NJ and also has a division in Toledo, OH. Fiske Brothers is better known now for their Lubriplate brand of oils, but they are still in business in both OH and NJ.
It is likely that during WWII when Willys was putting these winch kits together, that they purchased the one quart winch oil cans from Fiske Bros. since they were local to Toledo. Once they had the oil cans, Willys simply slapped their part number label over the Fiske label.
Thanks for pointing out the over-label.....Curiosity solved!
45 GPW, 44 Bantam Trailer, 45 M9A2 Paracasion, 44 M6A1 Mortor Hand Cart