* Power Stroke 6.7L V8 (current generation): This engine, found in Super Duty trucks, is often lauded for its impressive towing capacity and power. It's a relatively modern design and benefits from continuous improvements. However, it's also a complex and expensive engine to repair.
* Power Stroke 6.0L V8 (previous generation): While plagued with some reliability issues early in its production run, later iterations of the 6.0L improved significantly. Many who owned well-maintained examples speak positively about their power and longevity. It's important to note that finding a well-maintained example is crucial.
* 7.3L Power Stroke (pre-2003): This is often considered a legendary engine by many Ford truck enthusiasts, known for its legendary durability and simplicity. It's a naturally aspirated design, lacking the complexity (and potential issues) of later turbocharged engines. However, it's significantly less powerful than modern options.
In summary:
* For maximum towing and power in a modern truck: The current 6.7L Power Stroke is the top contender.
* For a balance of power and (potentially) better reliability compared to the 6.0L: A well-maintained later-production 6.0L can be a good choice, but buyer beware of potential issues.
* For legendary simplicity and durability (but lower power): The older 7.3L Power Stroke is a classic choice.
Ultimately, the best Ford diesel engine for *you* depends on your specific needs and priorities. Thorough research, including reading owner reviews and understanding potential maintenance requirements, is highly recommended before making a purchase.