What kind of motor oil does a 1990 Toyota corolla uses?

A 1990 Toyota Corolla's recommended oil type depends on the engine it has. Most likely, it's either a 1.6L 4-cylinder or a smaller engine. The owner's manual is the definitive source.

However, a common recommendation for that era Corolla would be 10W-30 conventional motor oil. Check your owner's manual to confirm the grade and whether it specifies synthetic blend or full synthetic. The manual will also specify the amount of oil your engine needs. Don't rely solely on this information; always check your owner's manual for the most accurate and up-to-date specifications for your specific vehicle.