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Can the Cummins 6.7L in the RAM 2500 realistically exceed 500,000 km in Canada?
Yes, and it is well-documented in Canadian fleet service. Properly maintained Cummins ISB 6.7L engines routinely reach 500,000-700,000 km. The key practices: oil changes at 15,000 km with 15W-40 full-synthetic (Rotella T6 or equivalent), DPF cleaning at 200,000 km if the truck runs predominantly short urban cycles (which saturate the DPF without completing a passive regeneration), and fuel filter replacement every 40,000 km. Verify the DEF tank and SCR catalyst condition — a DEF module failure costs $600-$1,400 but is not catastrophic if caught early. On fleet units with 300,000+ km, an inspection of cylinder liner clearance and injector spray pattern is prudent before purchase.