Short answer
BS-VI in India (from April 2020) and Euro 6 in Europe set strict particulate limits that diesel vehicles meet with a DPF, usually alongside an oxidation catalyst and, on many vehicles, SCR with AdBlue/DEF for NOx. Looking after the DPF matters more on these vehicles, especially in short-trip city driving.
On this page
This guide fills a gap identified in our research: DPF advice written for older vehicles does not always reflect how modern exhaust systems work. It is general guidance; your vehicle handbook takes priority.
What BS-VI and Euro 6 mean for DPFs
India moved directly from BS-IV to BS-VI on 1 April 2020. Like Euro 6 in Europe, BS-VI sets tight limits on particulate emissions from diesel engines, which in practice means diesel vehicles are fitted with a diesel particulate filter.
The rest of the exhaust system
A modern diesel exhaust typically contains an oxidation catalyst, the DPF and, on many vehicles, a selective catalytic reduction (SCR) system that uses a urea solution (AdBlue or DEF) to reduce nitrogen oxides. Some newer vehicles add a particulate sensor after the DPF. Faults in one part can affect the others, so diagnosis should look at the whole system.
City driving and DPFs
Stop-start traffic and short journeys keep exhaust temperatures low, so regeneration has fewer chances to finish. Owners whose driving is mainly urban should follow the maintenance advice closely and act early on the DPF warning light.