Well.. as per German lab who tested over dozen sample taken across the country around 2 years ago, reported very high level of sulphur in local refineries diesel.
I am sharing what I have been told by experts who conducted these tests and while I was writing a detailed article on fuel issues and especially the petrol with MMT additives.
BTW your local petrol is also used by everyone but it has high level of MMT, Catalytic converter blocks on average 40000KM, which is very much abnormal. Carbon deposits in the engine, ignition issues, fuel economy issues, plugs and many other engine internal problems are also very common a year or two being on the road.
Keep in mind, I am talking about the local refined HS diesel NOT the imported Euro 5 diesel fuel. Same goes for the petrol.