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The temperature regime of driving conditions in Nordic countries is very wide. This may have some effect on the performance and durability of the emission control systems used in todays vehicles, because normally these are designed with a less rigorous environment in mind. This paper describes durability and cold-start performance results obtained with two current technology TWC-cars in a full 80,000 km's on-the-road test under realistic driving conditions in Finland. The temperature extremes during the 24-month test period ranged from -28° to + 28°C. All vehicles were operated in day-to-day traffic as normal passenger cars without using any predetermined driving pattern. This practice is in contrast to the standardized durability run. The evaluation of long-term emissions performance showed a reasonable low deterioration over the test. However, at an early stage of the test one of the cars suffered from a mechanical failure in the converter unit leading to reduced performance.