best response i got so far which makes perfect sense. very grateful on the prompt reply. next question, since it is brand new, can we assume that its emissions are normal.... Of course. since it is also assumed that all brand new vehicles undergo formal emissions testing before they are released? Each brand new vehicle doesn't need to be tested for emissions by the dealer. This is the vehicle maker's (VM) responsibility. Each VM studies our emission standards and delivers cars that conform to our standards, or they cannot be sold in the market.
third ( i hope you dont mind rookie diesel engine queries), short of doing a formal emissions test, just confirming that black smoke from a diesel engine accelerating is indeed normal. when does it become excessive and need being brought to the casa? Excessive clouds of black smoke is obviously a sign that a vehicle needs service. On borderline cases (slight black smoke), the only way to determine if a car's emission conforms to the legal limit is through the use of an accurate smoke test equipment. A car failing the smoke test needs to be serviced as it is consuming too much fuel and polluting our air.
are there remedies to lessen such black smoke emissions like the 2T fuel additive, using euro IV compliant fuel, using diesel fuel with a higher octane rating (if there is such), using synthetic engine oil, using a special fuel filter, etc. I have no experience on these things you mentioned. In my case, I would clean/replace the air filter, and if this doesn't cure the problem, I will check/fix the fuel injection system or engine...
your replies are very much appreciated. hope you continue such. I'm glad....


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