XJ XJ8 / XJR ( X308 ) 1997 - 2003

Antifreeze/coolant type / color?

 
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Old 05-12-2019, 04:12 PM
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Question Antifreeze/coolant type / color?

So I got the message "engine coolant low", and figured I needed to top it off. The sticker next to the coolant fill says "use orange color only" (or something like that), but the coolant in my 2001 XJ8 is green. From reading on here, it appears that earlier models used the green coolant, but then Jag switched to the orange? Or did the previous owner(s) put in the wrong type/color?

Should I empty the radiator, flush it, and then fill it with the proper orange long-life coolant?
 
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Old 05-12-2019, 04:52 PM
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Originally Posted by TheRealMoleman View Post
So I got the message "engine coolant low", and figured I needed to top it off. The sticker next to the coolant fill says "use orange color only" (or something like that), but the coolant in my 2001 XJ8 is green. From reading on here, it appears that earlier models used the green coolant, but then Jag switched to the orange? Or did the previous owner(s) put in the wrong type/color?

Should I empty the radiator, flush it, and then fill it with the proper orange long-life coolant?
The main criteria is it being long life and silicate free....my advice is flush and refill and you will be good for another 50000 miles...also, make sure your cooling system is tight and leak free
 
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Old 05-12-2019, 08:19 PM
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Agree with the drain and refill advice, the recommended antifreeze is Pentofrost SF, available pretty much everywhere for around $8-$9 a liter, (dilute 50-50 with distilled water)




https://www.walmart.com/ip/Pentosin-...iABEgJs1fD_BwE


.
 
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Old 05-12-2019, 09:15 PM
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The coolant color is deceiving!!!!!!!
The orange coolant will LOOK green in the reservoir but if you take a sample, the Jaguar orange coolant will be ORANGE outside of the system.

I once had a customer accuse me of replacing the coolant with GREEN when I worked at the dealer.
He called the service advisor after I worked on the cooling system to report that the coolant in his car was GREEN.
I told the service advisor that we don't have green coolant here at the Jaguar dealer. We stock Yellow for the older cars (pre MY2000) and Orange for the later cars (2000MY onward)

The service advisor told the customer to return the car for examination.

The customer called back and apologized after he once again checked the coolant.

He was amazed that the coolant looked green in the reservoir but was ORANGE when he removed a sample in daylight.

Coolants come in colors of BLUE, GREEN, YELLOW, PINK, ORANGE etc.,etc.,etc.,etc.,etc.,etc.,etc.,etc.,etc.,etc., etc.,etc.,etc.,etc.,etc.,etc.,etc.,etc.,etc.,etc., etc.,

Color is NOT the be-all-end-all of chemistry.

bob
 
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Old 05-12-2019, 09:27 PM
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Originally Posted by TheRealMoleman View Post
So I got the message "engine coolant low", and figured I needed to top it off. The sticker next to the coolant fill says "use orange color only" (or something like that), but the coolant in my 2001 XJ8 is green. From reading on here, it appears that earlier models used the green coolant, but then Jag switched to the orange? Or did the previous owner(s) put in the wrong type/color?

Should I empty the radiator, flush it, and then fill it with the proper orange long-life coolant?
The colour of the coolant is not a criterion for determining the type of coolant. There are mainly two types of coolant by chemical composition: 1) Ethylene Glycol based (the traditional coolant, normally green or blue but it may also come in other colours including orange, red and purple) and 2) OAT i.e. Organic Acid based, mostly orange colour.

The mentioned two types must not be mixed as it would cause serious clogging of the cooling system. It is possible that the OAT coolant was used by one of the POs of your car, thus the warning label (it was not a factory fill). Since you now have green coolant (Ethylene Glycol), it is best that you stick to it. You can top-up with any green coolant as it will be Ethylene Glycol based which can be safely mixed with your existing coolant. Pentofrost SF is Ethylene Glycol based but it carries a small note that it should not be mixed with other coolants. For Pentofrost NF, it is stated that it can be mixed with other coolants.
 
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Old 05-12-2019, 09:56 PM
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I agree with not looking so much at the colour but the chemistry. Look at all the different coolants Zerex produces.



 
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Old 05-12-2019, 11:19 PM
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Hi TheRealMoleman,

There is a tremendous amount of confusion about Jaguar coolants (and coolants in general) and I confess I haven't figured it all out myself, but I keep trying. I am attaching a document that helps clarify some of the details relevant to your Jag and specifies three different coolants:

D985 was conventional blue/green-colored ethylene glycol-based coolant with corrosion inhibitors based on traditional Inorganic Acid (or Additive) Technology (IAT).

D542 was a yellow-colored coolant manufactured by DOW Chemical Co. and used briefly by Jaguar. Despite extensive searching I have not found any document that discloses its chemistry. If someone reading this has such a document I would be grateful if you could post it. EDIT - see my next post.

Extended Life Coolant (XLC) is also mostly ethylene glycol with a smaller amount of diethelyne glycol, and corrosion inhibitors based on Organic Acid Technology (OAT). This coolant meets (Ford) specification WSS-M97B44-D, and the most commonly-available versions are Ford Motorcraft Orange OAT, and General Motors Dex-Cool, originally manufactured by Havoline and now by Prestone. You can view the Material Safety Data Sheets for these products at these links:

Ford Motorcraft Orange OAT Coolant MSDS

Texaco Havoline Dex-Cool MSDS

Prestone Dex-Cool MSDS

As already mentioned by M. Stojanovic, IAT and OAT corrosion inhibitors do not play well together and the inhibitors can reportedly form a gel or sludge that can clog small passages in the cooling system, such as in the heater core. Furthermore, they do not offer equal corrosion protection for all possible cooling system material combinations (iron, steel, aluminum, copper, brass, tin, zinc, plastic, rubber, etc.), so engineers take this into account when specifying a coolant. Additionally, OAT coolants do not protect metal water pump impellers from electrolysis or cavitation erosion, which is why plastic impellers were introduced around the same time as OAT coolants.

You will also find coolants that use Hybrid Organic Acid Technology (HOAT). A commonly-available example is Zerex G-05. HOAT coolants do not play well with either IAT or OAT coolants and are not recommended for your X308.

A fourth type of coolant is Nitrited Organic Acid Technology (NOAT), an OAT with nitrite added.

I agree that if your car has conventional green IAT coolant you should be fine to top it up with the same. But if the label you found indicates that at some point your car was converted to the orange XLC OAT coolant, it would be worth extracting some of your coolant to see if it only looks green in the reservoir as Bob described, but may actually be orange or a color that probably used to be orange. If so, you only want to add the correct OAT type coolant. Orange Dex-Cool is the most common and affordable type.

Which brings us to the most important question: why is your coolant low?

There are plenty of common leak points on the X308, including the thermostat housing, valley hoses, octopus hose, the hard plastic hoses like the one that connects the reservoir to the radiator overflow nipple, the water pump, the radiator, etc. Some leaks can be very difficult to locate. If a leak isn't obvious, look again using a flashlight in the dark - tiny leaks will sparkle in the beam of light.

If there is dried coolant around the reservoir cap, the thermostat could be seized in the closed position, causing excessive pressure in the system to be released by the cap. The instrument cluster temperature gauges are notorious for not moving above the middle until the coolant has reached excessive temps (I measured 239F on our 2003 before the gauge needle began to move above its middle "normal" position).

Please keep us informed.

Cheers,

Don
 

Last edited by Don B; 05-13-2019 at 04:44 PM.
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Old 05-13-2019, 10:12 AM
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Don B Coould the yellow D542 coolant have been G-05? I have heard that the factory fill on the X300 was this coolant. Considering you mentioned they only used it for a short time and the 6cyl X300 was only made for three model years, it certainly is possible.
 
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Old 05-13-2019, 12:29 PM
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Jaguar used the Yellow (D542) coolant up to 1999.
The change to Extended Life Coolant (XLC) was described in TSB 100-16 (issued 11/99).

bob
 
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100-16 XL coolant.pdf (82.4 KB, 2 views)
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Old 05-13-2019, 03:17 PM
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Originally Posted by AJ16er View Post
Don B Coould the yellow D542 coolant have been G-05? I have heard that the factory fill on the X300 was this coolant. Considering you mentioned they only used it for a short time and the 6cyl X300 was only made for three model years, it certainly is possible.
Hi AJ16er,

Thank you for asking that question! It jogged my memory that I actually had found the chemistry of Jaguar/Dow D542, I just haven't found an exact chemical match among currently-available coolants.

Based on the disclosed chemistry, it is not evident that D542 was an HOAT formula. However, we can't be certain because compounds not considered toxic or otherwise dangerous are typically not disclosed on the Material Safety Data Sheets.

By definition, "organic" compounds contain a carbon atom. The D542 MSDS discloses no carbon compounds, while the G-05 MSDS does.


Here's the disclosed chemistry of Jaguar D542 / DOW 542:

Ethane-1, 2-diol (another name for Ethylene glycol) (CAS 107-21-1) 90% - 100%

Sodium hydroxide (CAS 1310-73-2) 0.5% - <1.0%

Disodium tetraborate pentahydrate (CAS 11130-12-4) 0.3% - <1.0%

Sodium hydroxide (NaOH) is commonly known as Lye, widely used in soaps, drain cleaners, anti-freeze and many other products.

Disodium tetraborate pentahydrate (BH13NaO8) is commonly known as Boric Acid or Borax pentahydrate, widely used in detergents, paints, anti-freeze, and many other products.

Note that neither of the above contains carbon, so they are considered inorganic compounds.


Here's the disclosed chemistry of Ashland/Valvoline/Zerex G-05:

Ethylene glycol (CAS 107-21-1) >=90% - <=100%

Diethylene glycol (CAS 111-46-6) >=1.5% - < 5%

Sodium Benzoate (CAS 532-32-1) >=1.5% - <5%

Sodium Tetraborate (CAS 1330-43-4) >=1.5% - <5%

Sodium Benzoate (C6H5COONa) is a carbon compound widely used as a food preservative and for many other purposes.

Sodium Tetraborate (Na2B4O7 10H2O) is also known as Borax decahydrate and is used in detergents, cosmetics, fire retardants, anti-fungal products, the manufacture of fiberglass, and as a flux in metallurgy.


From the above, we can say that while the principal ingredient of D542 and G-05 is the same (ethylene glycol 107-21-1), the additives/corrosion inhibitors are different, so D542 and G-05 are not the same coolant.

We cannot tell whether D542 is an IAT, OAT or HOAT coolant because we do not know if all of its ingredients are disclosed on the MSDS.

G-05 contains a carbon compound and therefore qualifies as an OAT of some sort. Zerex deems it a Hybrid OAT (HOAT) coolant, which is confirmed by the fact that one of its additives is organic and the other is inorganic.

I am attaching the Material Safety Data Sheets for D542 and G-05. If anyone can identify a commercial coolant with chemistry similar or identical to that of D542, we will all be grateful.

Cheers,

Don
 

Last edited by Don B; 05-13-2019 at 10:29 PM.
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Old 05-13-2019, 07:40 PM
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I've used Prestone 5/150 Orange Extended Life coolant 50:50 with distilled water for many years.
No overheating in Hot desert temperatures.
 
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