In reply to a message from Alex Kitney sent Wed 13 Jun 2007:
According to the JDHT CD that I have, your VIN number, like mine,
is in the ‘‘renew every 4 years/ 60,000 mile’’ category. I don’t know
if you are a JEC member but one of their recent Technical Topics on
the XJ8, taken from official Jaguar service bulletins, stated that
cars between VIN 812256 and 878274 use YELLOW coolant part number
JLM20404. This conforms to ESD-M97B49-A you mention, and ASTM
The blue/green stuff you have right now sounds like old D985
coolant, which is no longer available and which was only used in
the early XK8. This should have been converted anyway by service
action S813 to use the yellow type. (of course it could be some
unbranded stuff, not genuine Jaguar that’s in there.)Contrary to
what other posts have said the JEC article warns against mixing,
because apart from shortening the coolant life the corrosion
protection is adversely affected.
I would not risk anything other than the proper Jaguar stuff in
your Cat -it’s not that expensive compared to risking cooling
system problems later (I was charged about �23 for 3 litres)
The original message included these comments:
I have a Jaguar JTIS CD myself, and it says for my X308 (1998) to
use Jag Antifreeze / Corrosion Inhibitor ESD-M97B49-A. And that it
should be renewed every 4 years.
The thing is I am confused by the colour of what is in the system
at present. It is a Greeny/Blue as I said and I have never seen
coolant of this colour before? So am I thinking that two types and
therefore colours have been mixed at some stage?
The JTIS manual between the lines sugests to me that the coolant is
the ‘longlife’ type, as it notes changing every 4 years or 60K.
Brian: '99 XJ8 4 litre, West Sussex UK
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