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<blockquote data-quote="Cowabunga" data-source="post: 6078174" data-attributes="member: 718"><p>In terms of CO2 pollution they are much cleaner. In terms of NOx and particulates they are about equal. So on balance Diesel engines are 'cleaner' than the newer high efficiency petrol engines. The gap has narrowed on average though, because CO2 [fuel consumption] has decreased on petrol engines just as NOx has decreased from diesels. Both are now commonly fitted with DPF/GPF [filters].</p><p></p><p>I had a look right up the pipe of my diesel Honda the other day and could not believe that after 40,000 miles it literally looked like new. Like no exhaust gas of any kind has ever been through it. The Volvo on the other hand, does have some visible sootiness about it at half the mileage. Whether that's a result of regeneration by the Volvo or a leak around the DPF, I don't know, but I noticed an unusual sootiness at the outlet [for a DPF equipped car] from very early on. Its not as if there were no DPF present, but not like other's I've had either, which have all been spotless.</p></blockquote><p></p>
[QUOTE="Cowabunga, post: 6078174, member: 718"] In terms of CO2 pollution they are much cleaner. In terms of NOx and particulates they are about equal. So on balance Diesel engines are 'cleaner' than the newer high efficiency petrol engines. The gap has narrowed on average though, because CO2 [fuel consumption] has decreased on petrol engines just as NOx has decreased from diesels. Both are now commonly fitted with DPF/GPF [filters]. I had a look right up the pipe of my diesel Honda the other day and could not believe that after 40,000 miles it literally looked like new. Like no exhaust gas of any kind has ever been through it. The Volvo on the other hand, does have some visible sootiness about it at half the mileage. Whether that's a result of regeneration by the Volvo or a leak around the DPF, I don't know, but I noticed an unusual sootiness at the outlet [for a DPF equipped car] from very early on. Its not as if there were no DPF present, but not like other's I've had either, which have all been spotless. [/QUOTE]
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