If you need the car fast, just swap the engine, but not sure what's the price/where to source.

For preventive action, check the car weekly during weekends, to observe the coolant/engine oil/transmission luid/power steering fluid/brake fluid level. Send to service center/workshop (if lazy/don't know how to debug/fix) when seeing abnormal change.

Err... no engine oil indicator/warning in saga flx?