* A 3.8L Buick V6: This was likely the most common engine. It's a relatively small displacement V6 for the era, emphasizing fuel efficiency over outright power.
* A 5.0L Oldsmobile V8: A larger displacement V8 option offering more power than the V6.
To know for sure which engine is in *a specific* 1983 Oldsmobile Delta 88 Royale, you'd need to check the vehicle's identification number (VIN) or the engine itself. The engine's displacement (like 3.8L or 5.0L) will be cast into the engine block.
