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Okay, back from a Subaru dealer now. I called around before I left. The quotes were $26, $31 and $34. I am surprised by this kind of variation. At $26, it is only $10 more than Pentonsin A3. I can live with it.
The reservoir is small. It literally was bone dry. But I only needed about half a quart to fill it to slightly below 'full'. Maybe I can use distilled water like I did last time. But the speed at which the coolant is used is a bit alarming, so I went with the real deal this time. (Last time it was just below 'low'.)
I am pretty sure that it is not just evaporation. All my other cars don't use coolant so fast. I don't think it is easier to evaporate from BRZ than my other cars. (One is close to 20 years old.) So if engine is burning a small amount of actual coolant (instead of just water evaporating from reservoir), replenish with actual coolant makes a lot of sense than water. That is just my 2 cents.
Also the radiator cap needs to be turned about 120 degree, not 1/4 turn. Slightly different from my other cars. All good now. The coolant was totally full in the radiator. I am glad that I took a look today and potentially avoided some big issues. To those who did not check recently, 'Please take a look at your coolant'.
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