I'm in Brisbane. When I originally started looking for a treg, I was intending on getting the V6dti. I wanted the air suspension as a minimum. There was a V8tdi for sale and it was the cheapest in the land at the time, and it happened to be here in Brissie, so I went and checked it out because it was only about 5k more than the V6's I was checking out. Needles to say, I ended up purchasing the V8. I had heard that there was an issue with early V6tdi's in terms of one of the engine seals which I have seen a few in my local dealership getting repaired. I was advised that they modified the seal from about 15 onwards, so just be aware of that. Mine is a 13 model, and I absolutely LOVE it. What is there not to love about it. 250kws/800nm, six pot/four pot brembo brakes, full surround cameras, four zone climate, sports leather R-Line seats, radar cruise etc etc. Now, I know you can get some of those options on a V6 but you have to be lucky to find one. 0-100 in 5.8 seconds is nothing to sneeze about and the V8's are bulletproof from what I have been told. My vote is don't discount the V8TDI. As for offroading, I've taken mine on the beach, and it has surprised me, and my mate with his 14 model range rover sport. I've out all terrain tyres on it, and if you are careful with your driving, they shouldn't have too many issues on the beach. Of course, it will really come down to driver error rather than the cars fault if I was to get bogged on the beach, and I ain't doing anything stupid to put it in a position where it's going to be stranded. I've used it on off-road tracks in a national Park too, and again, it's going to be driver error rather than the car, as I would woose out before the cars capabilities were reached. It gets too expensive otherwise. You can get V6tdi's with a low range gearbox, but they are rare nowadays as they have become popular, and I've seen them do what I have been talking about on the national Park tracks, but do it alot easier. It will come down to personal preference, but have a drive of both. Oh yeah, the diesel V8 noise from within the cabin sounds just like a modern euro petrol V8 which I love as well.
Anyhow, enjoy your search.
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