What a pity this entire thread wasn't titled "5.0 ... only".

People seem to have argued against jag's schedule for the 4.0/4.2 - rather pointless that argument - instead of sticking only to the 5.0.

Er... it's not obvious to me that the OP's car actually is a 5.0. Is it? Had the 4.2 etc been discontinued by 2010?

 

Closer examination will show that he has a 2014 XKR and he too was frustrated that the dialog was diluted and obscured by discussing the vintage long out of warranty 4.2 conventional engine. His query was specifically that Jag is now recommending 6 month oil changes. They have stopped recommending anything for the 4.2.

 

Agreed, other than the 5.0 is not yet a mature product with a known track record of good, bad and ugly. It is prudent to refer to lessons learned from it's 4.0/4.2 predecessor and use these as a guideline, hence the clarification of severe service.

 

Thats precisely the problem: there is no correlation between the 4.2 and 5.0. The 4.2 has no technology that is critical to type of oil. Every technology on that car has been around since the war.

The 5.0 is built around the use of the oil designed for it- thats why it was. The cams are highly dependent on oil, as the timing is oil controlled not electric motors. The timing chain is highly dependent on oil and the carbon buildup problem is highly dependent on oil.

Moreover the 5.0 Direct Injection which oil phased cams is a new technology for the entire auto industry. Again everything done on the 4,2 has been around for 50 years. Better yet, DI engines and hydraulic tensioners on them have failed across the board with every car manufacturer. So there is reason for prudence and not to apply outdated practices to it.

 

we are finally getting somewhere. comparing the 4.2 to the 5.0 in lubrication strategy is like comparing a bicycle to a Ducati.

Anyone interested in reading what is so different about the cam phasers and why Lothar had to replace all 4, see this link Cam-Torque Actuated Variable Valve Timing System ? Feature ? Car and Driver

 

That isn't quite true, I'm sorry. The same OPA actuation theory used in the N/A AJ33/AJ34 (2 phasers) is used in the AJ133, however the CTA system in the AJ133 has separate intake and exhaust timings (4 phasers).

 

Do us all a favor. Instead of writing responses, spell out your knowledge in one post, and stop worrying about the last word.

 

Thanks David. I appreciate being pointed in the right direction. That's just it, we the affected are desperate for every ounce of credible information we can get.

As you can see, both Lothar and I have taken your suggestions to heart. And frankly we tried the alternative it landed us with stretched chains. Not a lot of people here get that.

Theer is another shocking tidbit that has come to light on another thread (fType) MANY DEALERS ARE NOT USING THE RECOMMENDED OIL. Says so right on their invoice. Which would explain the premature failures that those of us who bought ultra low mileage cars are experiencing.

 

But his post says 2010. Why do you say 2014?

 

Its a tragedy that most people dont actually read or only see what they want to. Because they are just here to debate as a matter of sport instead of help. Thank you for catching that. Yes he has a 2014, i.e one of the latest, and under warranty. I.e. the one that Jaguar did the latest recommendation on and the one that Jaguar is most interested in protecting, due to skin off their own backs.

 

reading this theme I will do every 6 months, even at 60 euros a oil liter, which is i am being asked to pay for the v12. Indeed it is recommended every year but after purchasing, it was 9 months and i have it done, I will do it even faster next time.

 

That's not what he says. See quote from post #1 above.

 

Precisely my point. None of us seem to care what the thread owner said. Or even people like me repeated countless times. If we read his post, that Jaguar has made new recommendations, it makes so much of the banter on this thread moot.

I wont show you where his post is- you should see for yourself how difficult it is to find data when it is buried in opinion. Ironically, the poor chap has only made 2 or so posts. He gave us more in 2 posts than we gave him in a hundred.

 

You should do the oil change yourself, because you can and they have clowns working at your dealership. Its very easy. You dont even get dirty. I think your engine like mine has a tube to vacuum the oil.

Its as simple as:
Pump
pour new oil in.
pump old oil into container.

Its also a great way of making sure they dont put the wrong oil in.

 

My emphasise above.

 

So now you're giving technical advice for Jags fitted with V12 engines. What's your background with those?

 

Why would take a personal shot at me? What business is it to you?
He is my friend, and no he doesnt have a Jaguar with a V12 fool.
Again your illness is speaking with authority on something you know nothing about and demeaning the other person. There are 4 threads now with all sorts of people telling you the same thing. All within the last 12 hours. Why do you do this? Its not very becoming of a Jaguar owner.

 

Back to the Oil.

Its not how long the oil last. Its about how much sludge is building up in your engine. Which an oil test will absolutely not tell you.

All the costly repairs reported so far on a 5.0 has in my calculation stemmed from sludge in a 'low-tolerance' engine. I call it low in the literal sense.

Oil is a fantastic cleaner when new. So the question really is how many times a year do you want to clean your engine out. For me once a year is not within my comfort zone. I am a perfectionist, I probably keep the rest of the car cleaner than I should or could.

 

I do care and on every one of his posts he has a 2010. Show me his post where he hasn't.

Wouldn't the Jaguar warranty period for the entire engine re oil be over?

 

I could be incorrect but wasnt the new advisory from Jaguar to recommend 10K mile / 1 year intervals?