I've never understood why people say that. Just about every vehicle I've ever had left with over 150,000 miles and never needed anything other than wear items replaced ie tires, brake pads... My truck I have now is an F150 and I was just talking to a guy the other day and I told him I was planning on driving it till 200,000 miles and he said on that 5.4 that won't be a problem at all he gets them in all the time with over 300,000 miles on them. He also made the comment that even though I've got 140,000 on mine it still looks like it's only got 20,000. The only thing I've ever had to do engine wise was valve cover gaskets on a Ranger that thing was bought with 90,000 and sold with 154,000 and it also sold for $1000 less than what I originally bought it for.