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@bq
I can imagine blocked DPFs killing a lot of black cab and bus engines.
I think the govt/industry/boris should be encouraging a transition to LPG for cabs and buses. The engines are quieter, more powerful, last much longer and have virtually no harmful emissions. Economy is worse but fuel is much cheaper. What's not to like? Mercedes and Nissan have surely got suitably torquey large-capacity petrols that could go into their cabs in LPG form.