2.5L ('98-'01) what color/type of coolant 2.5l ranger

[youngbuckwithapickuptruck]

im finding all sorts of conflicting info online on what type of coolant to use in my 2.5l ranger. i think i have orange in there right now but i plan on doing a hose water flush then diluted water flush then add in xx amount of green coolant concentrate.

is green coolant the correct type for my engine? what is the "chemical name" for green coolant? label says "phosphated organic acid technology" label on 'green coolant' also says hyundai/kia/mazda, i suppose ford coolant type changes over the years. just wondering: do all different size ranger engines in the 98-00 range use the same coolant?

supertech brand coolant at walmart seems to only be available in 50/50 jugs

 

[BobSacamano]

The shop manual for 2000 Ranger states that you need ESE-M97B44-A. it is green. Here is an example of what you want: https://www.npdlink.com/product/antifreeze-coolant-motorcraft-green-pre-diluted/214160

 

[cape_royds]

The first reply says it all.

Youngbuck, please note that the P-OAT coolant you mention in the OP is something called "Specialty Green," for certain Mazda and Ford models. That is a later, different coolant. What you need is the older type of green that Bob linked to (Inorganic Acid Technology.)

I also want to add that the spec for your truck has never changed, even though several other types of coolant have been introduced since it was made.

The chart from Ford, linked below, dated 2025, clearly repeats the original specification:

"Green-colored engine coolant approved to Ford specification ESE-M97B44-A (Motorcraft® Premium Antifreeze/Coolant)"

https://www.fcsdchemicalsandlubricants.com/quickref/coolantsEN.pdf

The reason why I'm belabouring the point is that you might hear people saying that the Yellow coolant replaces everything else. But from what I have found out, this is not necessarily true.

I just put up a thread earlier this week, concerning the Yellow, so I got coolant specs on my mind.

 

[youngbuckwithapickuptruck]

what happens when you mix green coolants?
P-OAT + Inorganic Acid Technology.?

 

[cape_royds]

what happens when you mix green coolants?
P-OAT + Inorganic Acid Technology.?

Not good. The two types have ingredients that may chemically react with each other, causing sludge.

How bad it is, and how fast the bad things happen, I don't know. But everything I've seen online says it's not good.

The last time I mixed coolants was back around 1989, with a beat-up '73 Cadillac, that was already dying from multiple causes. So I can't really speak from experience. All I can do is pass along what I've read.

 

[youngbuckwithapickuptruck]

cant find anything labeled "inorganic acid technology" nor could i find any labels that mention ESE-M97B44-A at the walmarts.

"The reason why I'm belabouring the point is that you might hear people saying that the Yellow coolant replaces everything else. But from what I have found out, this is not necessarily true." -cape-roids
but is it somewhat true?

my truck currently has gold/orange/brown-yellow in it, at this point im thinking i should just stick with "all purpose gold"

 

[cape_royds]

cant find anything labeled "inorganic acid technology" nor could i find any labels that mention ESE-M97B44-A at the walmarts.

"The reason why I'm belabouring the point is that you might hear people saying that the Yellow coolant replaces everything else. But from what I have found out, this is not necessarily true." -cape-roids
but is it somewhat true?

my truck currently has gold/orange/brown-yellow in it, at this point im thinking i should just stick with "all purpose gold"

Yellow replaces Orange and the dark "Specialty Green" (i.e. not your green.) But since that covers most of the Fords built in the last fifteen years, the idea seems to be out there that, "Yellow replaces everything."

But according to that 2025 chart from Ford, Yellow does NOT replace Gold, NOR does it replace the old "Premium Green" (which is for your 2000 Ranger.)

Yellow won't replace Orange in your truck, because Orange should not have been there to begin with.

The safest advice for me to give you is to flush the system, and refill with Premium Green. Anything else comes with a risk. How big a risk, or how fast it happens, I can't say from experience. I can only repeat what I've seen elsewhere.

If I were you, I'd follow the original spec. I'm a "go by the book" kind of guy. The book says ESE-M97B44-A, and they've never changed it.

IMO, the expense of replacing the fluid is less than that of dealing with possible future problems from the wrong fluid. So why risk it?

Somebody might say, "It's an old truck--whatever." But that's not the way I see it. I want to keep the old machines on the road for as long as possible.

A quick web search for "ESE-M97B44-A" shows the stuff is still available. Shop around.