If the question is whether to switch from an oil weight of 5W-30 for example, to a 10W-30, or visa-versa, the answer is… it depends. Some vehicle manufacturers provide a range of recommended oil viscosity grades based on the temperatures in which the vehicle is operated. Other manufactures recommend using only one motor oil weight or viscosity grade. We highly recommend always following the manufacturer’s specifications for your exact make and model which can typically be found in your owner’s manual.