BestSyntheticOilGuide.com and TheWirecutter.com each offer a comprehensive guide of the best synthetic oils for car owners, as of 2016. Synthetic car oils are typically preferred over conventional oils because they are designed to provide superior mechanical performance.
When choosing synthetic oil for a car, check the car manual to identify the viscosity that the car requires, then examine the results of scientific tests performed on popular oils such as Mobil, Castrol, Pennzoil and Royal Purple. Choose oils that do not form deposits when exposed to increased heat. Oils with low cold-cranking viscosity levels help reduce the risk of battery strain.