If you run WVO on the 642 engine you need to reflash the ecm and get rid of the post injection cycle and DPF. It will clog faster, run the cycle more often and the byproducts of WVO will end up in the engine oil from the post injection cycle and the oil will turn to jelly-sludge. This has nothing to do with the quality of the fuel, just byproducts of the oils used. Change the oil often and delete the DPF for long life or you will hate the vehicle.

I love mine, it has been 3.5 years now and 60k miles of bliss, just ran 5k mile trip to Florida with 3 adults and 2 kids, 5 weeks and just an amazing machine. Even with a huge Thule box on the roof, cargo rack out back it still turned in 28-30mpg USA, running a good speed but easy on the uphills. It really disliked Florida diesel fuel, not sure what % of biodiesel is mandated as some pumps were labeled B20 (which I avoided) and others were not labeled anything but it was not great fuel, tank was usually empty at 500 miles, vs minimum 600 average.