Can a Buick engine fit in a Oldsmobile 98?

Yes, a Buick engine can fit in an Oldsmobile 98, as both brands are part of General Motors and share similar platforms and engine configurations. However, modifications may be required for proper fitment, including adjustments to mounts, wiring, and exhaust systems. It's essential to ensure compatibility with the vehicle's transmission and other components for optimal performance. Always consult with a mechanic or an automotive expert before undertaking such a swap.