Fortunately, these motors are capable of running low sulfer diesel (with impact to service life), which is available in sub 2,000 PPM in all of the countries we will be visiting. The life is highly dependent upon fuel cleanliness, much more so than sulfer level. Pumps and Cats are the most fragile. The critical consideration is proper filtration, but the NZ spec. truck lacks the particularly problematic systems like DPF, urea injection, etc.
From our research, the critical level is around 2,000ppm and in recent years, sulfer content has dropped considerably, with South Africa now offering 50ppm LSD and Argentina shifting actively to a 500 or less PPM offering and two chains of stations offering ULSD to meet incoming EURO5 cars.
The countries along the route we are doing have been dropping sulphur levels for the past few years.