What is the best coolant you can recommend for my 2001 XKR. Many thanks.

 

You can use anything that meets the spec WSS M97B44-D, assuming your car has the correct stuff already in there.

Jaguar JLM20972 obviously does, as does Ford Premium Super-Plus (although it isn't orange..)

The Jag product used to be more expensive, but not so much now. Heritage shows it at £13.66 (Inc UK VAT) for a 2 litre container
https://parts.jaguarlandroverclassic...ntifreeze.html

which is cheaper than I have found the Ford listed, although ymmv.

 

And there is the issue, how on earth can you tell what's already in there? Colour doesn't mean a thing any more. I have a gallon the coolant to spec but I'm not what's there already.

As I understand it there is the risk of a wrong mix creating sludge that can block waterways so a full flush is required. Can I just add some of the new stuff to some of the coolant already in there and see what happens or doesn't it work like that?

 

The same applies to all the fluids.

That's the reason I do a complete fluid change on any 'new' to me vehicle. It picks up on anything that may have been missed in maintenance, gives a baseline for future servicing and removes any doubt.

Graham

 

Indeed. There's no guarantee, but - from MY 2000 on all cars were fitted with the WSS-spec coolant so it's a safer bet than for earlier cars, and it's what the dealership would have used when it was doing the servicing.

I guess the fail-safe has to be that, if you're not certain what's already in there, then do a full chemical flush.

There's a TSB regarding this linked in motorcarman's post:
https://www.jaguarforums.com/forum/x...3/#post2538528

and one (attached) that contains instructions in the event of a flush being needed.

 

TSB for you.

 

Thanks guys. It looks like the mixing would not cause sludge but impair the corrosion protection which I suppose in turn would lead to blockages.

That chemical flush procedure looks very daunting indeed. Very daunting.

 

Doc, it's not that bad:- just a tad time consuming. I made the change from DOW years ago and if I can do it without poisoning anybody or setting fire to something, anyone can

 

Well I guess so. Some planning will be needed.

A 'tad' time consuming. At least I am time rich.