Actually this question has been bothering me.

The engine oil maintenance period of Myvi is 5000km or 3 months, whichever comes first. Since the distance between office and house is small, my mileage usually will reach only <2000km 3 months after the last service.

About a month ago I went to back Perodua service center to have my aircond checked and the counter staff found out that i've passed the 3-month service period (actually it's 3 months and 2 weeks). She strongly advised me to change the engine oil even though my mileage is just about 1500km (because of chinese new year I became a passenger, not a driver). I argued with her that it doesn't make sense because the engine oil is still 'clean' and the mileage was hardly near 5000km.

She couldn't give me any solid reason and at last she showed the 'maintenance book' to me and said '5000km or 3 months, whichever comes first is written in this book, we have to send this record to head office so that when you claim for warranty, they can make sure that your vehicle is properly maintained on schedule'. I kept arguing my point and I refused to change the engine oil until now.