I have been driving for 2 years and 5 months, battery just died 3 weeks ago. It will die just like that. Better don't take the risk, change it every 2 years.

iinm, power steering fluid change every 20k interval. you double confirm ur car maintenance manual.

u can also make it a 40k interval. since u r going to service other things as well, so the labour is included. price of fluid im not sure but not expensive. some people do the top up only at 20k interval but definitely must to drain and refill at 60k interval of course. perhaps your case is drain and refill at 60k. then the 20k interval maybe power steering fluid level is still there so no need to top up.

Usual rule is if tak makan banyak minyak then boleh pakai. The main concern is would you want or can afford to top up engine oil every time it hits a certain lower limit.

For example I heard it's recommended to check and top up engine oil every time you pump petrol, if you're driving a rotary engine car like RX7. My point is if such burning engine oil is permissible to car like that, then it should be reasonable for campro as long as owner can afford to top up engine oil regularly.