What weight engine oil should you use in a BMW x5 4.4i v8 engine with 180000 miles?

For a BMW X5 4.4i V8 engine with 180,000 miles, it's generally recommended to use synthetic oil with a viscosity of 5W-30 or 5W-40. These weights provide optimal protection and performance, especially in varying temperatures. Always check the owner's manual or consult with a mechanic for specific recommendations tailored to your vehicle's condition and maintenance history. Regular oil changes are crucial for maintaining engine health, especially in higher-mileage vehicles.