The root of the cause is the placement of the air intake, which is under the seat. There is no pre-filter, and the air box itself doesn't always get closed properly (operator error). If you operate in an extreme dusty environment, this is something that should be addressed. Operators are installing snorkles to get the intake point higher away from the dust cloud directly under the vehicle. There are also some after market filters that are popular.
These air intake dust ingestion problems are not just with the diesels, in fact, I think this is the 1st diesel operator that I have read with this problem, but they are not as popular as the gas models.
Aussieranger; Thanks for the warning, but many of the members on this forum are aware of these "potential" issues. Those that are aware are so because they spend a little time on these forums. They are also aware of other potential problems, and cures that are associated with their particular machine. Your dealers service manager is not the most progressive way to learn about the short coming of a vehicle that you operate. There are 100's of 1000's of Rangers being operated in the US, and they are far from perfect, but a little bit of knowledge can go a long ways to managing your investment in your product.
Welcome to the forum!
2015 570 Ranger MS
EMP Aluminum Roof
Marshall Motoart 2.5" Lift
Viper Max 4000 Winch
Super ATV Lexan Half Windshield
SATV 30" light bar
27" ITP Blackwater Evo's
Classic Accessories Quad Gear Seat Covers