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Old 23-03-2021, 04:52   #1
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Diesel Coolant color type to use

Hi, Its been a ling time since I bought engine coolant. My Universal M25 is drained but it had green coolant. Is it correct that Prestone coolant is now yellow and not green, and I can mix them? I believe Prestone yellow 50/50 is the recommended one to use.
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Old 23-03-2021, 05:01   #2
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Re: Diesel Coolant color type to use

Take the non toxic product if you have a water heater in the boat. In case you have a leak in the heating coil in the water heater the engine coolant can mix with the domestic water supply. I just had this happen on our boat.
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Old 24-03-2021, 05:18   #3
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Re: Diesel Coolant color type to use

It’s impossible to know what chemicals are in the coolant, just by seeing whether it’s blue, green, yellow or orange.
3 Modern Coolant Types:
Organic Acid Technology (OAT) coolant
Hybrid Organic Acid Technology (HOAT) coolants
Inorganic Acid Technology (IAT) was usually found in a bright green color, and was typically used before the mid 1990s.
Prestone Antifreeze/Coolantshttps://prestone.com/products/
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Old 24-03-2021, 07:21   #4
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Re: Diesel Coolant color type to use

I like to avoid the red or pink coolant simply because marine diesel fuel is also red. If I see dried pink or red residue I’ll know immediately that it’s fuel if my coolant is green.
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Old 24-03-2021, 07:37   #5
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Re: Diesel Coolant color type to use

Quote:
Originally Posted by Buster007 View Post
Hi, Its been a ling time since I bought engine coolant. My Universal M25 is drained but it had green coolant. Is it correct that Prestone coolant is now yellow and not green, and I can mix them? I believe Prestone yellow 50/50 is the recommended one to use.
As Gord said, but it bears repeating, you cannot tell coolant chemistry from color. Furthermore, mixing coolant of different chemistries is a very bad idea. Sooo, mixing yellow and green coolant could be ok or it could be a real problem. It all depends on the chemistry.

You need to follow the engine manual on coolant chemistry. Putting a gas engine coolant into a diesel engine is also usually not a good idea. I have read of some old diesels where this is ok, but all of my diesel engines required coolant rated for diesel engines.

My Ford truck has a diesel engine made by International that had gold colored coolant. Ford also has a green colored coolant but they are not the same and should not be mixed since they are different chemistries. My JD tractor has a Yanmar engine that has green JD coolant that can be used with the Ford gold coolant since they are the same chemistry.

Confused yet? Makes sense?

I have used JD green coolant to replace the Ford gold coolant, which is just fine, because the chemistry is the same. Mixing the Ford green coolant with the Ford gold or JD green coolant would not be a good thing to do.

Confused yet? Makes sense?

Read the manual. Put in the coolant chemistry recommended by the manual. If it doubt of the coolant chemistry in the engine. Flush it out.

Later,
Dan
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Old 24-03-2021, 08:29   #6
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Re: Diesel Coolant color type to use

PRESTONE 50/50 PREDILUTED ENGINE COOLANT/ANTIFREEZE is Yellow, as are some other Prestone products.
Prestone also has Red, Blue, Green, Teal, Pink, Violet, & Orange coolants.
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Old 24-03-2021, 08:35   #7
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Re: Diesel Coolant color type to use

I think the color is a marketing BS.

I have been using Pestone in everything for my entire life with no problems. Cars, trucks, motorcycles, tractors, boats, it works in all of them.
Some engines are cast iron, some aluminum and some are a mix of both metals. Iron block and aluminum head, brass radiator.
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Old 24-03-2021, 09:51   #8
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Re: Diesel Coolant color type to use

Quote:
Originally Posted by Buster007 View Post
Hi, Its been a ling time since I bought engine coolant. My Universal M25 is drained but it had green coolant. Is it correct that Prestone coolant is now yellow and not green, and I can mix them? I believe Prestone yellow 50/50 is the recommended one to use.
Practical Sailor magazine reviewed engine coolants in late 2014 and some brands. They recommended following your engine manufacturer for TYPE of coolant. They generally recommend Heavy Duty Coolant for diesel engines and changed every 1,000 hours or five years which is more frequent than those for trucks. I used to use Prestone and switched to Peak Final Charge Global.

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Old 24-03-2021, 09:55   #9
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Re: Diesel Coolant color type to use

The coolant never touches the fuel so what is the big deal? ( unless you blow a head gasket )

If it is compatible with all metals, its good.
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Old 24-03-2021, 10:56   #10
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Re: Diesel Coolant color type to use

FWIW, in answer to my specific question, I had a "certified" Yanmar mechanic tell me that the ONLY antifreeze to use in my JH-TE Yanmar is Prestone ORANGE colored antifreeze. According to him, all others-especially those of a different color-will do damage to the Yanmar cooling system.
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Old 24-03-2021, 12:45   #11
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Re: Diesel Coolant color type to use

Quote:
Originally Posted by sailcrazy View Post
FWIW, in answer to my specific question, I had a "certified" Yanmar mechanic tell me that the ONLY antifreeze to use in my JH-TE Yanmar is Prestone ORANGE colored antifreeze. According to him, all others-especially those of a different color-will do damage to the Yanmar cooling system.
Prestone “Command” Heavy Duty Concentrate and 50/50 Antifreeze/Coolant are Nitrite Organic Acid Technology (NOAT) for use and compatible with ANY NOAT Extended Life Heavy Duty antifreeze/coolant in ANY diesel-powered commercial vehicle engine or stationary engine. It’s dyed ‘Red’.
https://prestonecommand.com/products...reeze-coolant/
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Old 24-03-2021, 13:01   #12
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Re: Diesel Coolant color type to use

I have been running regular Prestone in my Yanmars forever with no problems.

On the jug " Compatible with all metals" Our Toyota Prius had two different colors of coolant. Engine coolant one color and Inverter coolant another. Both have gotten the same Prestone for since 2005 no problems.

The coolant temperature ranges of engines are about the same depending on the pressure rating on the coolant cap.
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Old 25-03-2021, 06:20   #13
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Re: Diesel Coolant color type to use

I’ve moved to Evans permanent coolant in my Yanmar 3GM30F.

It’s worked very well.

I did worry about toxic coolant used to heat drinking water, but I found (tested) how bitter the coolant is and figured that I could taste it if there was any real leak.
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Old 25-03-2021, 06:35   #14
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Re: Diesel Coolant color type to use

I'm no expert on the matter.....but isn't just adding water a coolant ?? The colored stuff is really just an "anti-freeze", really only required in northern climes.

I've always put plain water in my engine heat exchangers, with maybe a cup of antifreeze...never had a problem...

Seawater is cooling the fresh water all the time the engine is running.

Interesting thread though....I might learn something here....
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Old 25-03-2021, 06:45   #15
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Re: Diesel Coolant color type to use

Quote:
Originally Posted by MicHughV View Post
I'm no expert on the matter.....but isn't just adding water a coolant ?? The colored stuff is really just an "anti-freeze", really only required in northern climes.

I've always put plain water in my engine heat exchangers, with maybe a cup of antifreeze...never had a problem...

Seawater is cooling the fresh water all the time the engine is running.

Interesting thread though....I might learn something here....


The color “stuff” is more than just an anti freezing additive, it’s also corrosion protection. Plain old water is a good coolant, but unless you’ve scavenged the oxygen from the water and kept it that way you’ve invited corrosion into the engine block.
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