Why is the cost of Labor Charge more expensive than the cost of the spare parts to be used?

How many KM should be reached to require Gear oil change?

How many KM should be reached to require Timing Belt change for each of the Models?

Is it possible for AAB to fix the vehicle using the parts bought from outside (If the customer provides the parts)?

Is it possible for the Periodic Maintenance of a Coaster bus to be done in any Quick Service Centers? Or it can only be done at the Main Workshop?

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