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cryostasis

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I think regardless of implementation, if the added complexity reduces reliability and introduces forced failure modes it's reasonable for people to avoid these systems altogether. For example, EGRs causing fouling or DEF engine throttling.

This may be true for our group, but I know numerous blue collar workers at the poverty line struggling due to these systems. Corporations / manufacturers have no incentive to make these systems more accessible. Even if they did, more complex -> more expensive to repair.

It is not just hate because of EPA requirements. These engines are more complicated and prone to failure. Small time operations can not afford the expensive repairs combined with loss of income during repair downtime.

As a result, only corporations remain or the few remaining owner operators avoid any engine newer than the year ~2000. These older vehicles also have the added benefit of having minimal electronics, sensors, and ECMs.