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Originally Posted by NachtRitter
OK, so nothing firm, just speculation ATM? I recall the banning of diesels in CA, which triggered the need for DPFs and DEF, etc. Auto/engine manufacturers are already looking at the next gen diesels, which (combined with better quality diesel fuel) can eliminate the after-treatments. I think the biggest challenge for diesels is not the EPA but rather the improved efficiency of the gasoline engine (combined with electric) vs the greater cost of the Diesel engine.
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DPF's started use in California in 1985 on passenger cars. Even after this introduction they banned all diesel cars regardless of how clean they were. This is why car companies are so cautious about bringing new diesels to the market in the US.