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My local Walmart has valvoline 15w-40 diesel motor oil for $ 3 a gallon. Brickseek inventory was off as usual but I did see one at my local Walmart. Sorry for the basic post but I am posting on mobile format.
Brickseek link:
https://brickseek.com/walmart-inv…u=4966045
Walmart link:
https://www.walmart.com/ip/Valvol…14&veh