I believe that Mobil 1oil does not meet the latest specs for the 5.0L engine, OW-20 and STJLR.51.5122.

The Jaguar 5.0L engine is basically the same as the Land Rover 5.0L.

 

Whatever car I own, I use what the owner manual explicitly calls for, what the franchise dealerships uses, or what the oil manufacturer says meets the requirements in the owner's manual.

I had to send the page out of my owner's manual to Mobil to figure out which Mobil1 product was the right one in my Aston. V12 calls for Mobil, the V8 for Castrol. That is good and all, but there are several Mobil1 oils.
I emailed Mobil, and engineer called me back. After I scanned the owner manual page, he pointed me to the exact motor oil. In the end, it was the same exact on the dealership uses... Oh, at least in that case it was double confirmed, lol.

My biggest fear is the manufacturer denying a claim or gesture of good will because I did not use the correct product.

 

Ah.... Someone else here has an actual understanding of the issue the poor OP faces! Tip of the hat to you good sir!

Wonder how long before this turns into another "It's an oil problem" thread? Oh wait..... It has already started...

 

Sorry to read off and hope it can be fixed cheaply. 0w20 oil ?

 

According to this it does:

https://mobiloil.com/en/motor-oils/mobil-1/mobil-1-esp

 

Would someone please enlighten me to just what this "dreaded design flaw" is in the 5.0L engines?

 

Any time i have read on Problems on jaguar gas models from 10-on All had been using 0w20 oil

 

Chains and tensinors

 

I'm paranoid now I hear a tic tic tic on my 09 xkr but it's been doing it for a few years! Am I doomed? It runs perfectly.

 

A flaw in the design of the timing chain tensioner (basically the guide arms and plunger) for early 5.0l engines is causing the tensioners to allow excessive chain slop, leading to catastrophic destruction of the engine if unnoticed.
As our cars are often garage queens, the failure has arrisen well outside the warranty date, yet as early as 40K miles.

JLR corrected this mistake in late 2012, and removed the faulty parts from inventory while releasing a TSB informing dealership to use only the new design from now on.
JLR will not freely replace these parts, so updating to them will set you back a few grand from your own pocket if you choose to do so.

Note: This is not a 4.2l issue, only the first 3 years of the 5.0l production.

 

Thanks, would you have a link to the TSB you could post?

 

I read that and did not find where Mobil 1 ESP meets JLR spec STJLR.51.5122. Can you point me to where ExxonMobil says it meets that spec? Proper viscosity, by itself, does not necessarily meet that spec. Additives matter.

 

Tensioner problems, repairs, and proper engine oil have been thoroughly discussed on the new XJ (X351) Forum. See:

https://www.jaguarforums.com/forum/x...t-done-214277/

https://www.jaguarforums.com/forum/xj-x351-53/dealer-put-wrong-oil-car-214892/

P.S. From this X150 Forum
https://www.jaguarforums.com/forum/xk-xkr-x150-33/5-0-timing-chain-new-information-attn-techs-159928/

 

I’m a bit insulted by your response. Also please re-read the specifications on that page. The desktop and mobile version are a little different but say essentially the same thing

[.

 

You didn't scroll down far enough (which has caught me out many a time!), near the bottom of the linked page it says:

Mobil 1 ESP X2 0W-20 has the following approvals:

1. MB-Approval 229.71
2. Porsche C20
3. VW 508 00
4. VW 509 00
5. GM dexosD Licensed
6. STJLR.51.5122
7. STJLR.03.5006

 

You shouldn't be insulted, as it was not my intent to insult you. I read that link 4 times on my Galaxy S8 and didn't see it. I see it now after clicking on Specifications and scrolling down to 0W-20. Thanks for pointing it out. If you had posted that screenshot in your initial post, you would have avoided this unpleasantness.

 

Doomed...

 

I am so glad I have the 4.2 , I would love the extra power but not the concerns. If I upgrade it will be to a later model 2013 and up, but happy for now.

 

I have never seen a design flaw last 149,000 miles.
I know BMW and other Germans would love to have this design flaw.

 

Yes its been a great performer for 149K miles. I am getting a report from the mechanic today which I will share once I have it.

I tried jump starting it from my wife's car, it did not seem to have the power to get it started. I had experienced that before. When I installed a brand new battery it cranked up and sounded as if it was not firing on all cylinders and crazy rough. It cut out. I started it three times and I managed to get in to reverse out of garage before it cut out again. Lumpy, loud, black sooty water from tail pipe.The Check engine light flashing and then The Restricted mode warning came on.
I changed the oil every 8K with Mobil 1 Extended Life 5 / 20 which is what I understood to be the same specs as The Castrol oil. It appears that should have been 0/20??

No ticking beforehand. Ran and idled Perfectly! I did have a check engine light that came on and off. It suggested that it may have been the MAF Sensor. Had it looked at and they said it was good. Light would go off for weeks and then pop back on for days. No loss of power. No gas mileage decreases. Accelerated as always. Had spark plugs changed $5K miles prior to this happening. .