Dilemma-
Bs3 Vs BS4 battle fought on google umpired by me-
Following facts were found
# bs3 = euro3 , bs4 = euro4
# bs4 means a ' catalytic converter' is a mandatory adition to the exhaust system .
It is located little away from engine beneath the front seat.
It can be removed easily by thieves , same car can run without catalytic converter
but suffers from incresed noise and powerloss unless ECM is retuned by an expert, however, it is illegal to do so, both the theft and the car use. Cops are often (read always)unable to detect both the things, unless you report to them.
# catalytic converters are costly (Rs 33 k to Rs 60 k , in this segment of car) because it contains precious metals like platinum & gold (~ gold prices trend in last 2 years) hence prone for theft.
Gold and platinum accelerate the process of splitting the toxic gas in to relatively harmless gas .
Bs4 norms are compulsory in 13 or 16 large cities of India only for the purpose of RTO
Registration, Bs3 registration is allowed in the rest of India.However Bs3 & bs4 cars can run anywhere in India.
# bs4 cars require special bs4 compliant Bs4 diesel( containing low sulfer i.e.50ppm) , while Bs3 cars can run on high sulfer (500 ppm) containing bs3 complaint or bs4 complaint diesel.
# bs4 complaint diesel is made available in those 16 cities only . Rest of India receives Bs3 diesel only.
# reasons for not making Bs4 pollution norms mandatory all over India is that govt. feels that increase in the cost of vehicles will slowdown the auto industry.
# using bs3 diesel in bs4 diesel car can damage the precious metals of catalytic converter , but to a lesser extent, at the cost of owner.
# It is neither covered under insurance nor under warranty IMO.
.
...