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Just wanted to ask some general questions about coolant. My car almost 8 years old liao. Was told on my last servicing that coolant was "low condition", required $60 to change. I declined as i already spent some money on changing brake fluid and also replacing my fan/serpentine belt which they said was cracked. Servicing manual says change coolant every 30k. Car is being serviced once a year. I thought it was just a simple top up like washer fluid or what. I didn't look inside the engine bay. So i bought a 2L coolant bottle on 11.11 to "top up". I also watched some youtube videos, so i do know how to release the spigot valve at the bottom of the radiator for my model. To do a full change would probably require somewhere in the level of at least a a couple more litres. Hmm today morning went to take a look when my engine was cold, but the coolant in the reservoir tank is actually above the maximum mark. Then open radiator cap is u can see the fluid level but i know there's no marking inside. So should i buy more coolant and do a full flush? Is the above the maximum mark coolant level in the coolant reservoir abnormal? My engine temps dont seem to have any issue.