THE INTERNATIONAL JAGUAR 'S'-TYPE REGISTER FORUM

Glyn, do you think there's anything in the multitude of scare stories online about the use of OAT in classics?

Hi Orlando ~ Our company was the pioneer of extended life coolant using carboxylate and other inhibitor technology & holds more patents than any other. We also have more million mile tests under our belt than any other with just about every OEM on the planet including other than automotive applications. There is more nonsense spoken on the internet about coolants than just about any other oil company products. They are today universal in their use. Cooling systems are healthier than ever & less expended glycol is polluting our planet due to long service life.

There is nothing in the metallurgy, componentry or design of our Jaguar cooling systems that would make ELC's anything but absolutely ideal for their protection.

I am personally delighted that I'm running long life coolant in my S Type so that I can maintain the system in as new condition. One of the reasons I'm trying to eliminate coolant loss in shut down, heat soak conditions.

There are some that wish to get stuck in the past as though the past is somehow better. We should by all means learn from the past but technology marches on for the better. These products are tried & proven & mature. Fortunately most OEM's today consider lubricants, coolants etc. as a design component of the vehicle.

Interestingly I have been re reading one of my old Aston Martin books & the knowledgeable scribe points out that many of the issues experienced by Aston with the Watson/WO Bentley for Lagonda & Tadek Marek designed engines are simply of no consequence with modern oil technology ~ Amen!

Thanks very much, Glyn.

Thank's once again GLyn for you comprehensive explanation regarding anti freeze & coolant. As a matter of interest what have you put into your S type OAT or HOAT and what make is the product ?.
Cheers
Dave J.

Dave ~ I've had both OAT & HOAT coolants in my car already depending what I had to hand during the build. I'm not here to promote my old company's products. I don't mind if you use Prestone etc.

At present I have the following HOAT product in the system because it's approved for my Benz as well.

https://hallmarkoil.com/wp-content/uplo ... ne-XLC.pdf

Out of interest the Benz version of this product has been in my low mileage (31 thousand miles) Benz quadcam V6 engine for 10 years without change & is still clear & bright. Will easily go 15 years as long as I don't spring a leak.

I note since my retirement the rotters in the industry have steadily reduced recommended mileage from 10 years, to 8 & now to 5 years to try & sell more product. e.g. I note that Prestone's European literature still claims 10 years whereas their US literature states 5.

As long as the product remains clear & bright the non depleting inhibitors are doing their job. In totally captive systems slight evaporative loss can be topped up with deionised water as the inhibitors don't deplete. The only reason I recommend top up with premix is to ensure that glycol concentration does not drop in cold climates where antifreeze properties must be maintained and the user might not be sure of the mechanism of coolant loss.

Thanks for the info my S type has OAT in at present and it looks good colour wise.