I'm not sure if 3k miles vs 5k miles makes a big difference if your engine is ok (diesel injectors in good condition etc). In Europe, VAG is offering crazy 2 year/30 000 km (max) interval, I think that's definitely too much for any oil. They call it "Long life" system, but Short life would describe it better..
Btw, my relative has a Merc with OM642 diesel engine, he has driven 250 000 km with 6-8 month/25 000 km oil change intervals (229.51 low ash 5w-30 oil), and there is nothing wrong with the engine. DPF has been replaced once, expensive stuff..
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