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For copyright reasons, you are not allowed to copy an entire article into your post body. This is an instance wide rule, that is strictly enforced in this community.
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I'm doing some reading here, too. Seems like the additional maintenance expense caused by the exhaust recirculation can be expensive over the life of the vehicle. This isn't just maintaining/reparing the EGR system, but also maintaining/replacing other engine components that have a shorter lifespan due to the emissions controls. This makes sense to me.
It sounds like a pretty poor solution, but then we haven't meaningfully innovated on the internal combustion engine for how many years?