Toyota Coolent & Subaru Long Life Super Coolant Interchangeable?

[humfrz]

Originally Posted by Ultramaroon

It's 2 better.

But seriously, are they incompatible? That's the real question.

I doubt they are incompatible (chemically) ........ but, they were formulated to be more compatible with different elements of different cooling systems.


humfrz

[Packofcrows]

Originally Posted by i-engineer

Wow ... Toyota dealership near me is charging 40 for 1 gallon. What a rip off.

Sent from my SM-N910V using Tapatalk

Get it off Amazon. Like $23 last I ordered mine.

[aegisdrgn]

Originally Posted by humfrz

I doubt they are incompatible (chemically) ........ but, they were formulated to be more compatible with different elements of different cooling systems.


humfrz

I'm pretty sure they have different %'s of rust inhibitors / acids / and stuff, and if they are mixed, the commonly held belief is that the service interval is drastically shortened/sped up because of negative interactions.

[humfrz]

Originally Posted by aegisdrgn

I'm pretty sure they have different %'s of rust inhibitors / acids / and stuff, and if they are mixed, the commonly held belief is that the service interval is drastically shortened/sped up because of negative interactions.

I think we are saying about the same thing.

All the different "colored" coolants have different ingredients and/or percentages of ingredients.

In most of the coolants, ethylene glycol is the base ingredient.

The second largest ingredient is water.

The rest of the stuff in the jug can be generally classified as corrosion inhibitors and buffers.

Then we confuse the mix with a dash of phosphates and organic acids and some mixes exclude amines, silicates and borates.

Now, what I mean by “compatibility” is the old “jar test” ….. put a little of each in and shake it up and see what happens.

However, although the two may get along fine in the jar, doesn’t mean they will get along well with the different parts of different engines.

That is where and why the different manufactures have different formulas (colors) specifically designed to protect the parts of their specific engines, that come in contact with the coolant.

So, what to do ….. simply read and follow the owner’s manual …..

Now, back in the day (ya’ll knew this was coming), life was simpler …… in the fall, before first frost, one would drain out all the old rusty water and re-fill the cooling system with well water and alcohol (half & half).


humfrz