* Maintenance: Regular and proper maintenance is crucial. This includes oil changes with the correct weight and frequency, coolant flushes, filter replacements (air, fuel, etc.), and addressing any issues promptly. Neglecting maintenance significantly shortens engine life.
* Driving style: Aggressive driving, frequent towing heavy loads, or consistently running the engine hard will put more stress on the engine and reduce its lifespan.
* Operating conditions: Extreme temperatures (both hot and cold) and dusty or dirty environments can accelerate wear and tear.
* Previous repairs/modifications: Any previous repairs or modifications (especially poorly executed ones) can impact longevity.
While some Ford V10 engines have been known to reach incredibly high mileage (hundreds of thousands of miles) with proper care, others may require a rebuild at much lower mileage due to the factors above. You could realistically see anywhere from 150,000 to 300,000 miles before needing a rebuild, but it's not uncommon for problems to arise earlier or for the engine to last significantly longer. It's more accurate to think of it as a range rather than a fixed mileage number.
