Generally, coolant is diluted with water. Read the directions on the
container to know how much to water to dilute it with. It is best to use
distilled water (costs about 75 cents per gallon at a discount store).

The Prestone All-Makes comes either pre-mixed with 50% distilled water
or full strength. Do use only distilled water with this if the label
calls for it.

The "green coolant" is likely the traditional silicated coolant.
Silicates are very effective against aluminum corrosion and fights
pump cavitation damage. However, import water pumps use flimsy rubber
o-ring seals that can't deal with silicates -- they will leak. US (and
possibly European?) pumps use carbide seals and have no such problem.
Therefore, you should use the Toyota Red or Pink coolant with your
rubber seal pump.

The Red coolant is a 2yr/24K-miles type of coolant and is more
effective against corrosion than the 5/150 Toyota Pink. The Toyota
Pink uses only one of the GM Dexcool's two major ingredients and has
no fast-acting 2-EHA acid. The main selling point is extended service,
but when it comes to fighting corrosion it sucks.

The new Preston All-Makes I am not so sure, because it contains 2-EHA.
I don't know how this will affect Toyota plastics because 2EHA is a
plasticizer.

So your best bet is to find Toyota Red and distilled water, then
Toyota Pink. The latter is pre-mixed but cost the same (so Toyota
distilled water is about $30 per gallon). Dunno with Preston All-
Makes, although I'm leaning towards trying it instead of using the
Toyota Pink.