The best oil for a 2002 Mitsubishi Galant 4-cylinder depends on your climate and driving conditions, but generally, you should use
5W-30 conventional or synthetic motor oil. Always check your owner's manual for the manufacturer's specific recommendation. It will list the acceptable viscosity grades (like 5W-30) and may specify the type of oil (conventional, synthetic blend, or full synthetic).
While 5W-30 is a common recommendation, your owner's manual might suggest other viscosities depending on temperature extremes in your region. Using the incorrect viscosity can negatively impact your engine's performance and longevity. Therefore, always prioritize the information in your owner's manual.
