The proper ratio depends on the temperatures your vehicle will be operated/stored in. Typically, a 50/50 ratio will be just fine. If you will park/store your vehicle in extremely cold (sub-zero) temperatures, you can increase to 60% coolant to 40% water.
yes its the same place it might have an extra outlet for the turbo.
50/50 for most application
You need a 50/50 mixture of water and antifreeze.
Usually 50 / 50 mix ( Ford states not to exceed 60 % antifreeze and preferably distilled water )
Any Ethylene Glycol based coolant mixed in a 1:1 ratio with water. Prediluted means it is already in the correct ratio.
Genuine Subaru Coolant or equivalent (50% water & 50% Ethylene-Glycol basis coolant) as per page 10-13 of the "OWNER'S MANUAL".....
50/50
a 50/50 mix of good quality antifreeze and water
Minimum 50/50. Maximum 70/30 (coolant/water).
50% water to 50% coolant is the standard unless you live in a very cold climate where it goes down to -25 degrees F or lower, then you may want to mix 25% water to 75% coolant but never straight coolant.
50/50 50% Dex Coolant and 50% Distilled Water. This is assuming you did not buy a premixed gallon of coolant. This will protect you to -40 F.
Ok, 50/50 is pretty much the norm. Coolant is not what keeps your engine cool, the water is. The coolant is what keeps the water from freezing in cold weather as well as from causing corosion to your engine.