Valvoline Zerex Asian Vehicle Green antifreeze concentrate

This is Valvoline's green, silicate-free, phosphated HOAT antifreeze for vehicles whose factory coolant is green. Four names are printed on the front of the bottle: Hyundai, Kia, Nissan and Mazda. The product is a concentrate and must be diluted before filling.

Valvoline Zerex Asian Green antifreeze concentrate, front of the bottle

Photographs come from the manufacturer's official materials.

Who the green is for

If the fluid in your expansion tank is green, this is your product. In practice that means Hyundai and Kia, Mazda, Mitsubishi, Suzuki, Isuzu, Daihatsu and Daewoo, along with those Nissans and Infinitis that left the factory with green Long Life coolant.

The formulation is approved against Hyundai and Kia MS591-08, and Mitsubishi ES 64-217 is named on the data sheet.

If the tank holds blue fluid, your product is Zerex Asian Blue. If it holds pink or red, it is Zerex Asian Red.

How it differs from the blue and the red

Chemically, almost nothing. All three are the same patented family (US 5,454,967), all three are phosphated HOATs on an ethylene glycol base, and all three data sheets state plainly that they contain no silicates, borates, 2-EHA, amines or nitrites.

The laboratory results are identical as well: 10 out of a required 8 in the aluminium pump cavitation test, 0.1 mg/cm²/week against a 1.0 limit for hot-surface corrosion, and zero aluminium weight loss in ASTM D1384.

The one number where the green differs is reserve alkalinity: 6 for the green against 12 for the blue and the red. The sheet itself notes that a high RA is not a mark of quality, since many modern inhibitors do not raise that number at all.

So the choice is decided by the factory colour, not by the chemistry.

A concentrate, so you set the level of protection

The green is a concentrate too. One bottle, 1 US gallon (3.78 L) concentrate, yields 7.5 litres of ready-to-use coolant at 50/50, which covers a full fill on a Tucson, a Sportage, a Sonata or a CX-5.

The mixing rule is the same: concentrate first into a clean container, then water, mix thoroughly, and only then fill. Never pour neat concentrate straight into the system.

For the exact ratio see our dilution calculator.

Product photos

Valvoline Zerex Asian Green antifreeze concentrate, back label with dilution instructions

Dilution chart

Antifreeze 50% Freeze point −36 °C Boil point 128 °C Standard, equivalent to factory fill

AntifreezeFreeze point

Antifreeze	Water	Freeze point	Boil point	When to use
33%	67%	≈ −18 °C	≈ 125 °C	Weakest useful mix, for a mild winter
40%	60%	−24 °C	126 °C	The minimum on the manufacturer's chart
50%	50%	−36 °C	128 °C	Standard, equivalent to factory fill
60%	40%	−48 °C	133 °C	High altitude, severe winter
70%	30%	−67 °C	135 °C	Maximum protection, more is not better

The 33 per cent row is not on the manufacturer's chart and comes from the general ethylene glycol curve. Every other row is from the official data sheet. Below 40 per cent the inhibitor concentration also drops, so 33 per cent is for mild winters only.

Technical data

Part number	910238
Colour	Green / მწვანე
Base	Ethylene glycol
Technology	HOAT, phosphated organic acid
Glycols	91.0 mass %
Corrosion inhibitors	7.0 mass %
Water	2.0 mass %
pH (50% v/v)	8.4
Reserve alkalinity (RA)	6
Specific gravity 60/60 °F	1.1450
Flash point	121 °C (250 °F)
Silicon as Si	< 10 ppm
Borates as B	< 10 ppm
Chloride	< 10 ppm
Ash content	< 5 mass %
Boiling point, undiluted	175 °C (347 °F)
Storage stability	5 years

What it does not contain and why that matters

SilicatesSilicate drops out as an abrasive gel that grinds the water-pump seal.
BoratesBorate accelerates aluminium corrosion, which is why Asian OEMs dropped it.
2-EHA2-ethylhexanoic acid is a plasticiser that softens gaskets and plastics. It is present in many cheap “universal” coolants.
AminesAmines can form nitrosamines together with nitrites.
NitritesNot needed in a passenger-car aluminium system and attacks solder.

Laboratory test results

Aluminium water pump cavitation (ASTM D2809, 100 h)

Limit: Minimum 8
Actual: 10, a perfect score

10 means “perfect” and 1 means “perforated”. A direct measure of water-pump survival.

Hot surface aluminium corrosion (ASTM D4340)

Limit: Max 1.0 mg/cm²/week
Actual: 0.1 mg/cm²/week, ten times better than the limit

This test targets the hottest point of an aluminium head, exactly where aluminium engines fail.

Repassivation of aluminium surfaces

Limit: > −400 mV
Actual: +447 mV

Means a damaged aluminium surface rebuilds its own protective film.

Foaming (ASTM D1881)

Limit: Max 150 ml
Actual: 80 ml

Foam is air, and air does not carry heat. It also makes the pump cavitate.

OEM

Hyundai / Kia MS591-08
Subaru
Honda / Acura
Nissan / Infiniti
Toyota / Scion / Lexus
Mazda
Mitsubishi
Suzuki
Isuzu
Daihatsu
Dae Woo

ASTM D3306
ASTM D4985
JIS K 2234-1994
Ford WSS-M97B55-A
Mitsubishi ES 64-217
Federal Specification A-A-870A

All technical figures come from Valvoline's official product information sheet. Official technical data sheet (PDF) · Manufacturer page

Frequently asked questions

Can I mix the green and the blue?

We would not recommend it. Both are Asian HOATs from the same family, but they are different products, and after mixing you can never tell what is in the system. Choose the one that matches your car's factory colour and stay with it.

My Hyundai has green fluid and the level has dropped. Can I top up with the green?

If the system holds the factory green MS591-08 fluid, the green belongs to the same family and topping up is reasonable. If the fluid is more than five years old or you can see deposits in the tank, a full flush is the right move.

Is it genuine?

Yes, we bring it in from the United States. The part number 910238 and the label correspond to Valvoline's official data sheet, which is linked on this page.