Coolant flush or refill?

[StockEngine]

Hello,

Mirage yung unit ko, sana merong naka mirage dito. So yun nga, after ng 3rd PMS ko sa casa, nag try ako MOTECH, then pinalitan nila completely yung OEM na color blue coolant. However, I noticed a significant drop sa level nung coolant. Unlike dun sa OEM that lasted for 2 years at least. Yung huling PMS ko is parang months ago lang then nasa "L" level na agad yung coolant solution. So pinuntahan ko agad si owners manual, then check for leaks daw, fortunately walang leak na makita anywhere. May alam po kayo bakit nangyari yon? Is it bad since wala nmn leak?

Also, I ordered the PRO99 coolant online to refill until it reaches the "F" mark sa reservoir. Okay lang ba tong gagawin ko? May feedback ba kayo sa PRO99 na brand?

no need to change.. first top it off. meron ba smoke out of the tail pipe?

did it drop after a few days after the change over to a new. coolant? if so.. there was some air pockets that wasnt bled...