What is the engine oil capacity of a 1977 Jaguar XJS 5.3?

The engine oil capacity of a 1977 Jaguar XJS 5.3 is approximately 6.5 quarts (or about 6.2 liters) when including the oil filter. It's important to check the owner's manual or consult with a professional for specific details, as variations may exist based on modifications or specific engine configurations.