10-20 is pretty low, 33% being the usual minimum, and its also a rather wide range.

if the range is on the packaging it suggests their QC is iffy, but perhaps you determined it from the SG?

If its a SINOPEC product I would expect it to be OK (though I havn;t used any of their stuff) but their FD coolant page doesn't list an FD-20, nor do they specify the MEG content of any of their coolants

You dont say where you are, making it difficult to guess at the likely frost risk, (In Russia, for example, which Wickipedia tells me is one of the export markets, 10%MEG might not do) but the corrosion risk is probably fairly constant, and I've had very poor results from local Taiwanese stuff (not CPC) in that regard.

I would be inclined to try and source an "International" brand, perhaps from Prestone, which seems to be fairly widely available.

Re "what is the quantity I should use" the volume should be in your vehicle specs, but anyway you should fill the system. "Pure" concentrated antifreeze isn't available in Taiwan, but if you get some you shouldn't dilute it below the makers spec, which might be 33% but is typically 50%.

Some makers, who tend to be those supplying commercial users, produce a table of the cold tolerance given by different dilutions, which you can use to fit your local climate.

"Ready Use" antifreeze of course shouldnt be diluted at all, especially if it is only 10% MEG to start with

Some cars are difficult to fill without creating air pockets. In such a case, I routinely ran the engine to boil the coolant (into an overflow funnel) but its a fairly dramatic procedure with some disaster potential if you arent used to working on cars, so I can't recommend it. I believe vacuum filling devices (and perhaps services) are also available

Sourcing from big supermarkets perhaps gives you the best chance of avoiding fakes, if that is a risk locally, as it is in Taiwan, and on the Internyet..

"Traditional" or "Universal" 2-year life IAT antifreeze, if you can identify that, is probably the safest choice in the abscence of any technical spec that makes sense, the normal situation in Taiwan.

IF you can source it with a reasonable chance of avoiding fakery, and there is no frost risk, perhaps consider "Waterwetter" coolant from Red Line, which has no antifreeze effect. Americans seem to like it

Edited by edlithgow on 15/12/2024 at 00:22

FWIW, I have just read the label on the bottle of Green concentrate in my garage, which says 'Dilute according to instructions in car handbook' or words to that effect, also that the antifreeze has a 3-year life. My 207 handbook does not expect the coolant ever to need changing or topping up, and over the 16 years I have owned the car the coolant has remained pristine blue.

Recommendations which I recall seeing over the years have been 25% for 'normal' frost protection, 50% for maximum (e.g.Canada or Russia). Global temps have been rising so I guess the risk may be lessening. There seems to be no reason to expect 'better' corrosion protection with higher concentration of anti-freeze ?