My neighbors use Wolf's Head Motor Oil...
I'm getting ready to retire myself so, I'll use the term "elderly" with the greatest respect...
As an after reitirment business, my "elderly" neighbors(husband/wife) both long since retired, travel from festival to festival around Western NY State selling their Hotdogs, Hamburgers, Italian Sausage, Kettle Corn & Soft Drinks. Depending on the type of festival that they attend and the extra help(employees) that they'll need, they may not bring all of their equipment for cooking/popping
They pull/haul their heavy trailer and pull-a-long propane stove, kettle popper and coolers to each festival using only mini-van(s).
They use Wolf's Head motor oil(from SAM's Club) in their mini-van and put on ~ 200K miles around NY State with some repairs along the way before getting another used mini-van. They also use WH oil in their everyday vehicles(Fusion/Escape).
I believe that they get the WH oil in lager quantities from Sam's Club along with the food that they sell at the festivals.
I don't know if WH oil is any bargin at SC but, it's convienient since they buy their products from Sam's