Hell yeah id get it up / down the road and changed asap.
my civic was sold with an overheating problem, thermostat was goosed changed it flushed it out 3 times with water then filled up with coolent but it would still over heat.
garage just wanted the extras taken off the car, additional lights gearstick pedals etc
the wifes rover head gaasket was well on its way out using a ltr of water a day and the oil was a lovely light creamy brown. quick oil change and necked the water. garage never checked it over just offered her a grand for it