I have 4 of the V10 engines and had 1 of the 5.4. 2 are in F250 super duty regular cab, 4 x 4 trucks with manual transmissions. 1 has 308,000 miles and is a daily driver. The 2nd is my personal truck, 200,000 miles. My wife drives a 30' class C and pulls a 2 horse trailer all over Texas. Her V10 has 130,000 miles. The other is an F350 dually, flatbed I bought with 132,000 miles on it.The 5.4 had 153,000 miles since new when I sold it to my son. We lost 1 spark plug in the 308,000 mile truck. Everything else has been routine maintenance. We do all our own service work, all Motorcraft filters and fluids. Semi synthetic oil every 7500 miles. I love the V10, they will pull anything you want to latch onto and I find them very reliable.
