10. Ford 300 Inline-Six
The Ford 300 cubic-inch inline-six is a genuine workhorse, especially in F-Series pickups.
Its legendary reputation for simplicity and durability has made it a favorite among truck owners for decades.
According to Hagerty, this engine’s rugged design and ease of maintenance often see it running strong well past 200,000 miles.
Many consider the Ford 300 nearly indestructible—a true symbol of American engineering.