It's just as possible in a TD5 Defender too. People tell me I'm a fast driver, and the only Land Rover products that pass me on the motorway are Disco IIs (and IIIs too, but they've got a different engine). So it's clearly possible. In standard tune the TD5 engine isn't that stressed, and the revs are electronically limited. If you're remapped and are squeezing 200 plus bhp out of it, of course there are more things to go wrong. But that's a story for another day.