The Indian government has established a series of regulations known as the Bharat Stage Emission Standards to reduce the amount of pollution created by cars and two-wheelers (BSES). From 1 April 2020, all automakers including those of two- and four-wheeled vehicles are required to only produce, market, and register BS6 (BSVI) vehicles. Learn about the main differences between the BS4 and BS6 engines as well as the new BS6 engine's performance on this page.


Let's first study the present BS4 (BSIV) emission requirements, engine, performance, and its significance before learning about BS6 emissions or BS6 compliant engines.

The first emission standards, known as "India 2000," were introduced by the BSES, the country's regulatory body for emissions from all sorts of vehicles, in the year 2000. While the first versions of BS2 and BS3 went into effect in 2005 and 2010, respectively, BS4 norms with stricter emission limitations or standards went into effect in 2017.


Bharat Stage Emission Standards (BSES), the ruling organization, controls the pollution emissions from moving vehicles in the nation. The standards to control vehicle emissions in India are set by the Central Pollution Control Board, which is a division of the Ministry of Environment, Forests, and Climate Change.

India 2000 was the first emission standard or norm to be set, and afterward, BS2 and BS3 were introduced in 2005 and 2010, respectively. The fourth emission standard, known as BS4, was introduced in 2017, although the preceding three were introduced at regular intervals.

The BS6 emission standard, which is the sixth generation of the emission norm, is a substantial improvement over the BS4 standard in terms of reducing pollution. This is also because the BS5 (BSV) was omitted to transition to improved emission standards.

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Difference Between BS4 and BS6

The maximum allowable levels of pollutants that can be released from a car or a two-wheeler exhaust are defined by the emission rules known as BSIV and BSVI, respectively. The BS6 emission requirements are harsher than the BS4 ones. The biggest or most significant change is in the shape of tougher acceptable emission requirements, while manufacturers also use this transition to upgrade their vehicles with new features and safety criteria.

  • BS6 fuel has a sulphur concentration that is five times lower (10ppm) than BS4 fuel (50ppm).
  • BS6 fuel has additives that mimic the lubricating characteristics of sulphur but contains less sulphur than BS4 fuel.
  • Diesel Particulate Filter (DPF) and Selective Catalytic Reduction are both involved in BS6. It didn't involve BS4.
  • In the case of BS6, the Real Driving Emission norm will also be used to measure a vehicle's pollutant emission under real-world circumstances. With BS4, it wasn't the case.
  • Onboard Diagnostic (OD) functionality is present in BS6 but was absent in BS4.

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