(s1) coolant best type

[Kirbert (Author of the Book, former owner of an '83 XJ-S H.E.)]

Here, somebody on the XJ-S forum posted a photo showing why the radiator has to come out:

Another clogged radiator

These cars really are all the same. I’m on V12 #6, and yet again, the radiator is clogged with debris. They are literally ALL like this. Here’s another non-surprise… the DPO must have put in some extra cold thermostats because it doesn’t even come up to temp on most days. [image]