However, generally speaking, 5W-30 is a common and often recommended viscosity for many Mitsubishi 300GT models, especially in moderate climates. For hotter climates, a 10W-30 might be appropriate. For colder climates, a 0W-30 might be a better choice.
Crucially, consult your owner's manual. The manual will specify the exact viscosity and oil type (conventional, synthetic blend, or full synthetic) recommended by Mitsubishi for your specific vehicle's year and engine. Using the wrong viscosity can damage your engine.
