Yes, service should be done at authorised service centres only, atleast for 3 to 4 yrs or during warranty period. Ask service advisor not to change any part without clearance from you, the owner. At times certain part have enough life left in them, hence do not change with time only or the prescribed service e.g.4th paid service etc.However, oils must be changed as per laid down time(+10%max) as they turn acidic n can reduce engine life in long run.
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