A handful of diesel powertrains, built in the 1990s and 2000s, continue to clock over 500,000 kilometers without major mechanical failures. Volkswagen’s 1.9 TDI, a Cornerstone of DurabilityThe Volkswagen 1.9 TDI diesel engine remains one of the most recognized examples of endurance and simplicity. The longevity of the 1.9 TDI lies in its conservative design—no unnecessary electronics, no complicated systems, and easy access to parts. Close-up of the 1.9 TDI diesel engine of a Volkswagen Golf V – © ShutterstockToyota’s D-4D, a Lesson in Japanese EngineeringToyota’s D-4D diesel engine is another benchmark for reliability in the automotive world. Similarly, the 2.5 dCi diesel engine developed by Renault-Nissan has proven to be a durable workhorse.