It is unfortunately true that some dealerships may provide bad recommendations for oil change intervals in order to generate additional business for themselves. They may suggest changing the oil every 20,000 miles, despite the fact that this can cause damage to the engine and turbocharger. Indeed, when a customer is faced with the high cost of engine repairs, they may find it more cost-effective to simply purchase a new Sprinter rather than pay for repairs. This is precisely why some dealerships may provide incorrect recommendations for oil change intervals, as they may hope to generate additional business by selling new vans to customers whose engines have been damaged as a result of rare oil change intervals.
This is often done by dealers with the intention of causing issues after the warranty period has expired, at which point the customer will be responsible for costly repairs.
However, it is important to note that reputable diesel mechanics will typically advise against such excessive oil change intervals and will recommend intervals more in line with the manufacturer's recommendations. Whereas, For most diesel engines, the recommended oil change interval is around 7,000 to 10,000 miles or 12 months, whichever comes first.
If you decide to follow their bad advice and change the oil in the Sprinter every 20K, then we will be happy to provide you with repairs in the future, we can overhaul your engine when it breaks down. But you need to start save money now for this expensive repair in the future or change the oil every 7k.
It's important to always consult reputable honest mechanics to ensure that your vehicle is being properly maintained and to avoid any unnecessary repairs or expenses.