However, generally speaking, for that era of vehicle, the oil would likely be:
* SAE 10W-30 or 20W-40: These were common grades for gasoline engines. Again, your owner's manual will specify the recommended grade.
* Type: It likely called for conventional oil, but some owners might have used high-mileage or synthetic blends. Check your owner's manual for specifics.
Finding your owner's manual is crucial. Without knowing the specific engine, any oil recommendation is just a guess and could potentially harm your engine.