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heat will be absorbed and the products will be formed faster exothermic reaction will undergo spontaneously as it does not require any energy while endothermic reaction has to be supplied with energy to happen therefore exothermic reaction will be faster than endothermic reaction
So 5W-30 viscosity engine oil thickens less in the cold than a 10W-30, but more than a 0W-30. An engine in a colder climate, where motor oil tends to thicken because of lower temperatures, would benefit from 0W or 5W viscosity. A car in Death Valley would need a higher number to keep the oil from thinning out too much.or example, 10W-30 oil will thin out at higher temperatures faster than 10W-40 will. The owner's manual will advise the best viscosity range and the owner can then work within those parameters. With the right viscosity in mind, it's time to start shopping for a type of oil.