1st PMS first time car owner need advice please

Hello. First time lady car owner. Mag dudue na for first PMS yung wigo G ko nextweek and I received a text message from service center to schedule it. My question po, given na free ang labor how much kaya aabutin since usually change oil lang naman ang gagawin? My dilemma is wala pa rin orcr pending pa daw and medyo naiinip na kami Im about to email DTI na. Hindi pa nakaka 300k odo kasi nga takot kaming ilabas at mahuli. Pa advice naman po anong magandang gawin. TYIA!