There is no way this engine has a 2500 kms oil change interval, 2500 kms is for ancient engines like the vw beetle which uses no oil filter, has very dirty combustion and has an oil bath air filter.
This engine is also used in australia and in africa in offroad fleets which is several times more dusty and torturous than any road in pk.
If you look at the owner manual it tells you to use a synthetic CK+ rated multi viscosity oil and replace at 10000 kms. The 2500 kms oil change is usually on a pretty banner at the dealer and also at dumbass oil change shops who want to milk the owner by peddling the mantra of “naee rahegi”
This isnt new. People were proudly doing 500 kms oil changes in corolla 2.0D sold by indus motors just because “oil kaala hogya” and dealerships happily would take the money.
And dealerships being the lunatics and morons they are in Pk were filling them with sae50 oil in the name of “sunn engine” - these cars would not start below 10C at all as the oil behaved like glue in the sump.