I have seen them hit 1,000,000 miles but those are the ones I am talking about, highway miles don't seem to bother them as much. Not to mention the fact they are on average 20 years old and no matter how good they were new they are no longer new. If a customer brought me a blown up V10 I could replace it tommorow parts and labor for about $1200 out the door, that is a lot less than an injector pump on a cummins and we have had to replace them on stock motors