Your car’s engine is made to work with engine oil of specific density and viscosity, so sticking with the manufacturer’s recommendation is important. Here are some of the functions of motor oil in your car:
While your Altima is built to use either conventional or synthetic oil, synthetics tend to last longer and perform better than conventional oils. They also keep your engine cleaner. Synthetic oil costs around $2 more per quart, but that is one area where it makes sense to pay a little more.