@tyrone service intervals depend on ur driving condition mine goes gud till 5 to 6 thousand miles. as my car is driven at home,
if u drive in dusty conditions it may b lower, CNG cars are recomended frequent air filter changes i guess 1500 to 3000 kms.
@ahmed. thats common wid all imported cars, even lancers and vitz 99-05 also.
for ur cars betterment sumtimes get a 10 liter of HI-OCTANE wen u get ur tank filled this wud insha Allah be help full.
PAkistani petrol isnt up to the mark ( one of the reason D4d engines arent still introduced Locally) so thats where the car makes thoose knocking noises if u get a mixture of hi-octane the fuels OCTANCE level wud be correct and Insha Allah reduce the knocking.