Antifreeze for the Subaru Legacy B4
The B4 arrives in Georgia straight from Japan, almost always with a turbocharged EJ20 or EJ25. That means it carries the same boxer weaknesses as any other Subaru, only under a higher thermal load. The factory fluid is blue, so your product is Valvoline Zerex Asian Blue.
Photographs come from the manufacturer's official materials.
Cooling system volume (litres) roughly six to eight litres
A turbo puts the coolant to work twice
On a turbocharged EJ the coolant does not only serve the block and the heads. It also cools the turbocharger housing, and after shutdown the natural circulation of that fluid is exactly what saves the turbo shaft from heat soak.
So on a turbo Subaru the state of the coolant affects two assemblies at once. Depleted inhibitors and deposits show up first in the hot turbo passages and only later in the radiator.
In the ASTM D2809 test, where an aluminium pump runs for a hundred hours, Valvoline Zerex Asian Blue scores 10 against a required 8. On a turbo engine spending its life at high revs, that is the number that counts.
A Japanese import with an unknown history
A B4 bought at auction rarely comes with a service history. The system may hold the Japanese factory blue, or it may hold whatever somebody topped it up with along the way.
So our advice is simple: flush the system completely when the car lands, fill it with the right fluid and write down the date. That way the five-year clock starts from zero.
One bottle at 50/50 yields 7.5 litres. A B4 system holds six to eight litres, so two bottles are safer for a complete flush.