How much coolant I need to replace BMW 325i 2006?

To replace the coolant in a 2006 BMW 325i, you will typically need about 2 to 3 gallons (approximately 7.5 to 11.5 liters) of coolant, depending on whether you're performing a complete flush or just a top-off. It's important to use the recommended BMW coolant or a compatible high-quality coolant mixed with distilled water in a 50/50 ratio. Always check the owner's manual for specific capacities and guidelines.