I've read the 7 or so threads here about coolant but I have a dilemma. I'm sure the Dexcool in my '07 V8V needs to be changed. I don't have any reason to think it has caused any problems although I haven't removed my bad thermostat as of yet. I plan on flushing the system completely including the heater core and radiator with the garden hose method. After reading so many horror stories about Dexcool, I'm having a hard time making myself put Dexcool back into a freshly flushed-out system. I know a lot of guys on this forum say that with regular maintenance of your car and regular coolant changes, Dexcool is fine and I tend to agree but I'm really leaning towards trying something else. I know there are very subtle differences in the additives of coolant and I've read extensively on that subject but I wanted to put this question out there and get some feedback.
Has anybody ran Zerex G-05 in their AM? That's really the one I'd like to try.
Any comments?

 

The only coolant I've found with the same primary chemicals as the OEM Halvoline is Motul's coolant:
http://www.redpants.lol/shop/motul-coolant

Next closest is Jaguar's OEM coolant. Same primary chemicals but different chemical registration IDs.

Mixing the wrong coolants can cause serious problems. I've seen the Dexcool sludge firsthand. It can be really difficult to figure out what you can and cannot use these days because the colors have largely lost their meanings.

 

+1 to Redpants comments. The MSDS of Motul Inugel Ultra and Havoline XLC show the same active chemicals. I also have not found another exact match. DO NOT use G-05, it's a HOAT coolant, not an OAT coolant like the XLC.

The Dex-cool stuff is also an OAT coolant, but with other chemicals that aren't listed in the XLC MSDS. I wouldn't use it.

The Havoline rep told me that Xtended Life Coolant is compatible with XLC but mixing the two reduces the longevity of both coolants. I just did the job with the Motul stuff last weekend. The Motul is the same pink color as whatever was in the car before. It's a super easy job with an airlift.

 

No, Jag uses a different coolant. The Havoline Extended is the closest to the pink OAT AM uses,

 

I'd be interested to know where you get this information. According to the MSDS, the Jaguar Coolant, Motul Inugel and Havoline XLC all use ethylene glycol and sodium 2-ethylhexanoate. Pentosin Pentofrost SF may also have the same 2 ingredients, but I can't confirm that.

Havoline Xtended life uses Potassium 2-ethylhexanoate instead of the sodium product.

It would seem to me, and has been confirmed by Chevron, that the Xtended life is compatible, but not identical and not the direct replacement that the Motul and Jag coolants are.

 

You may want to consider a waterless coolant such as Evans. No corrosion, no expansion and you never have to change it again.

 

The data below is organized like this: Components / CAS Number / Amount

I colored red the CAS numbers for those chemical not found in the OEM Havoline XLC to make it easier to compare.

Havoline XLC (OEM)
Ethylene glycol / 107-21-1 / 60-100%
Sodium 2-ethylhexanoate / 19766-89-3 / 1-4.9%

Motul Inugel Optimal Ultra organic
Ethylene glycol / 107-21-1 / 80-95%
Sodium 2-ethylhexanoate / 19766-89-3 / <5%

Jaguar OEM
Ethylene glycol / 107-21-1 / 60-100%
2-ethylhexanoate Acid / 149-57-5 / <5%

Havoline Extended Life
Ethylene glycol / 107-21-1 / 80-96.99%
Diethylene glycol / 111-46-6 / 1-4.99%
Potassium 2-ethylhexanoate / 3164-85-0 / 1-4.99%
Water / 7732-18-5 / 1-2.99%

*water is added to the others so it doesn't count as a "not found chemical"

 

I registered just to post this information because I own a Vantage, and would hate to see a fellow owner murder his engine.
I would never use a pure glycol waterless coolant in a system that was designed for a water/glycol mixture. Although the boiling point is higher, pure glycol is less efficient at heat transfer than a water based mix. If you use this you are relying on the system's designed safety margin. The cooling system is designed to operate under worse case conditions. Unless your car was designed specifically for a pure glycol waterless coolant, your car will overheat under these conditions. I strongly disagree with some of the claims made for waterless coolants. I have worked in automotive engine R&D and have degrees in both Chemistry and Applied Physics.

 

@Redpants

I see this for the Jag/LR Coolant. Jag appears to offer two flavors, this is the Extended Life stuff which matches the Motul and XLC

SECTION 3: Composition/information on ingredients
3.2. Mixtures
Chemical name % CAS-No. / EC No. REACH Registration No. Index No. Notes
General information
Classification: DSD:
CLP:
107-21-1 01-2119456816-28-xxxx 603-027-00-1
203-473-3
Ethane-1,2-diol 60 - 98 #
Xn;R22
Acute Tox. 4;H302, STOT RE 2;H373
Classification: DSD:
CLP:
19766-89-3 - -
243-283-8
Sodium 2-ethylhexanoate 3 - < 5
Repr. Cat. 3;R63
Repr. 2;H361d

 

Welcome to the forum!

The coolants should be diluted, not pure glycol waterless. Here's what's I said in the link I posted:
"According to the manuals, both the V8 Vantage and DB9 will require 6 liters of Motul coolant. The V8 Vantage cooling system holds 12L and is diluted 50-50. The DB9 cooling system holds 15L, but is diluted 60-40 (40% of 15L is 6L, so the same amount of coolant concentrate is needed for both the V8's 12L system and the V12's 15L system)."

 

I didn't see that one pop up, is it the one for the US market or EU? Interesting they've got two of the "same' coolants with two makeups!

 

My reply was to the poster who suggested that Evans waterless coolants were "better".

 

Actually I only mentioned that some may want to consider Evans, particularly those who have vehicles that sit for long periods of time. Jay Leno for instance uses Evans and has featured the product in his videos. In all fairness I only use the manufacture's recommended products. Having said that everyone needs to conduct their own due diligence and I appreciate your concern and your opinion. Welcome to the Forum.

 

Well, all I can say about that is: he is a comedian and I am a scientist.

Thank-you for welcoming me to the forum.

 

Was thinking of my Jag when I wrote the post, the new Jag coolant is what you found and Jag has multiple coolants, so be careful which one you buy.