The ice road truckers use 15w40. About every heavy truck/equipment out there uses 15w40. The trucks have block heaters that circulate the water in the jackets to keep them warm enough for them to start. Its not because of the thick oil, its because they are diesels. You remmember the glow plugs on chevy diesels. Ive had big trucks in well below zero, the diesel fuel gelling up and freezing in the filters is much more of a problem then the oil. At the temperatures that 90% of the people operate thier cars on this site, no ones car isnt going to start becuase the oil is too thick. The thin oil is for fuel milelage, not reduced wear. Futhermore I will wager that most Taxi cab/car rentals use 10w30, since it is "alot" cheaper bulk than 5w20 and since profit is thier bussiness, it doesnt take much math. Alot of people would be shocked to know 10w30 goes into everything from quick lubes to dealerships, because its cheaper, so all those cars out there, most are being run on thick oil. Mixed fleets of diesels and gasoline, stock only 15w40, very few, if any stock bulk 5w20. These are the vehicles that get a bazillion hard miles on them by operators. Price it by the drum and you will see why and see if they have it in stock, because they ussually dont, because no one is buying it.