Normally all parameters need to be checked during the Periodic maintenance service interval.
If your SA has a good relationship with you ,he will care your ride like his own ride .
Ask someone to drive the car ,you stand back ,and notice ,with shifts of 1st and 2nd gears ,does the car produce uneven black smoke or any other variation in Smoke colour and amount .
If so it needs a EGR valve cleaning (EGR -Exhaust gas recirculation )