You know what and this may be a bold statement but I reckon more diesels have serious trouble than v8s. Well, 3.5 anyways, the only one you can trust.
Diesels are always turbo or headgasket or timing belt or rocker arms or whatever, ok ok v8s more often have the bonnet up but that's the ignition system, the v8 ends up shagged after 75k but it keeps running nicely for a very very long time, I mean there isn't much that tends to stop a 3.5 in a serious way apart from HGF which is pretty rare.