For information:

Jaguar specifications for 6.0 V12 (1993 to 1996) engine are:
13.6 to 16.3 bar (197 to 236psi)

With maximum difference between two cylinders
1.38 bar (20psi)

Standard compression ratio is 11:1 for 6.0 V12

Thanks to all for your replies.
Last time I replaced the cap and rotor (18months ago) I obtained Marelli rotor arm but the cap (supplied by British parts) was manufactured by Intermotor.

How frequently in terms of mileage would you recommend replacement?

personally , i have not bothered, as i have all new components of genuine Jaguar/Marelli production , no aftermarket caps, plugs or leads , cost a fortune, but worth it to me BB I realise this is over a year old, but wondered where you were able to buy genuine Marelli rotor arm and distributor cap ...

Welcome Leo, only been a member / Jaguar XJS owner for 18 months but found the club and online forum helpful.

Really useful posts. Just like to add to add a couple of useful documents (uploaded to mega as unable to upload PDF document here) https://mega.nz/#!zcBVCJpI!Qzdok8XOS9S3kf8TwLqeZ7Ecb7ERuVwHIJiAnuvNkvQ Delanair mk iii introduction https://mega.nz/#!iRhW2bqK!hZFG251t6jvgr9SknQdNM5lEeGGvhjFQUtevzX-NFc...

Thanks to all for taking the time to reply (Both Pauls and XJR-S) I initially placed an order for C41051 (heater water valve) from British car parts whom have given good service previously. Subsequently I was informed that they no longer sold the part. I had the heater hoses on order from Jaguar her...

Hi Paul, thanks for taking the time to reply. I've taken your advice and left temp turned up slightly to keep the heater water valve open to stop water loss while obtaining parts. C41051 seems to be no longer available from Jaguar UK, so oem or pattern part needed. Will certainly take your advice an...

Hi all. I am gradually rejuvenating so called climate control . Cooling needs replacement air conditioning compressor. Heating works OK. Good heat output, regulation of internal temperature I.e blows hot air into car until up to temperature when blower fan reduces speed and air temperature exit is r...

Hi Nick, I have 15psi caps on my 93 6.0l , haven't noticed any problems with it.

Regarding your engine, very impressive condition

Yes I have spotted this as I am trying to a an air conditioning compressor (Sanden) or equivalent for 1993 facelift V12.

Wasn't impressed by the prices quoted.
I realise they're in business to make a profit but frankly amazed at prices

I have used sound insulation from Dynamat on other cars I have owned, it was very effective at reducing sound levels.

Bought my 93 6.0 XJS in Oct 2014.

Joined JEC shortly afterwards, enjoyed driving 8000 miles in my XJS since I bought it.

Just wanted to say hello.

Also wanted to ask for recommendations for independent garages in Lancashire for servicing / repairs of the V12