What weight oil does a 1969 impala 427 take?

A 1969 Chevrolet Impala with a 427 engine typically uses 10W-40 or 20W-50 motor oil, depending on the climate and driving conditions. In cooler temperatures, 10W-40 is often preferred for better flow, while 20W-50 is suitable for warmer climates or for high-performance applications. Always check the owner's manual for specific recommendations.