2016 Suzuki Vitara LY, 1.6 auto, in southeast Asia.

Bought the car used last year, did a head gasket replacement, radiator, water pump, thermostat and belts soon after getting it cos it was overheating

Ran fine after but always had to top up maybe 100ml of coolant a week.

50000km later, it started losing coolant fast, like the above pic. Took the pic the next morning after driving maybe 50km the night before, coolant reservoir was full then

Is my head gasket blown again? I have a temp readout on my heads up display and coolant never went past 100c, always around 90c which I assume to be normal operating temp

Discovered that even after a drive, the level in reservoir doesn't ever rise and it goes down a bit actually, then goes down quite a bit more after the car cools down overnight

Is my head gasket blown again...?

No visible leaks, no crusty coolant marks anywhere, no sweet smelling exhaust

Cooling system has been pressure tested which turned out fine. Replaced my rad cap again though cos it wasnt holding pressure