* SAE 10W-30: This was a very common grade for that year and climate.
* SAE 5W-30: A slightly lighter weight oil, potentially preferred in colder climates.
Crucially: Don't rely solely on general information. Always check your owner's manual for the manufacturer's recommended oil type and viscosity (like 10W-30 or 5W-30), and the correct oil capacity for your specific engine. The manual will also specify the oil quality level (like API rating).