Jag recommends the WSS-M2C925-A in my 2010 XKR, but I can't seem to find that online. Some people say it is only available to the dealers. I did find some comments that WSS-M2C945-A may be an upgrade or the "public" version of the former that can be used.

Can anyone here confirm any of this, or offer an online place to buy the WSS-M2C925-A?

Thanks.

Try here
https://www.blauparts.com/jaguar-xkr...e-kit-50l.html

Jaguar changed the 5.0L oil spec in response to wear issues, so it's unlikely that you'll find that WSS-M2C925-A oil. It's jokingly called "Unobtainium".

See: https://www.jaguarforums.com/forum/x...6-5qts-228063/

Buy a GOOD correct viscosity oil.
People will scream, people will yell, people will throw a hissy-fit.
...... quality oil is quality oil.
I use Valvoline Modern Engine oil. Nothing has blown up yet.

Oil is Oil.

Finally - an oil thread.

It's been several months this time, double the previous record!

Ends in 9348B if memory is correct

Dont do the oil change like this Idiot . first he drains the oil from the sump then puts new drain plug in, Then he loosens the oil filter . loosen the filter first . I always removed it completely prior to pumping out the oil , then remplace the filter with a new one then put back on before adding 6 quarts let it sit for at least half an hour , Take a reading and top up at 250ml increments , It takes or holds 7.25 litres

Great video. Best part was when he mentioned that vacuum hoses dont break.

Also the carbon fiber hood hood. I wish.

I have used 5W-20 945-A for years, firstly in my 2010 XFR and then in my F-Type, both with zero problems.

There's no way I play with fluids with all of those leaves there..
And no offence to ACDelco, but that's not going into my car either.
And reusing a broken cap?!?!

But the cream on the cake was replacing the engine cover, lol.

Hey, I tried searching the forums here, but the search function seems to return random results that have nothing to do with the search terms. Also, searched Google general and specific to this forum. Nothing came up.

I liked when he said the hood was carbon fiber.

The video was semi useful as I have never actually seen the bared underside of my XK. It also provides some humorous footage as he seems to stumble through the oil change and he appears to have lost count of his quarts--by his count over 8 qts going in and no torque specifications apparently needed on either the plug or the filter cap. I did want to take my shop vac to this engine bay. He's a happy guy, though and there is a lesson here as I learned what not to do.

Video guy told me he did it from below using a $4000 lift rather than spend $14 on an extraction pump.

Are Jaguar and Castrol ripping us off?

Regarding the 5.0L engine, why did Jaguar recommend Castrol motor oil with a unique specification that was available only from your Jaguar dealer? (OK, a few auto parts stores had it, too, but it was very hard to find and was very expensive.)

Jaguar/Castrol motor oil contains a fluorescent dye. That makes it easy for dealers to challenge engine warranty claims by contending that the customer used the wrong oil, which caused the damage. Read this old thread from the XF Forum:
https://www.jaguarforums.com/forum/x...-us-off-93240/

It was prudent to use the recommended Jaguar/Castrol oil while your car was under warranty to avoid warranty issues. Since that's no longer a concern, I agree with Cee Jay's Post #4 that any high quality fully-synthetic oil of the proper viscosity (0W-20 or 5W-20, depending on where you live) will work, provided you change it (and the filter) every 5,000 miles/12 months or sooner.

There's no unique miracle additive in Jaguar/Castrol oil that makes it significantly better than any other high quality oil on the market. If it was, it would be required by every car manufacturer.

And I forgot to add, never once have I used Castrol let alone the special Unobtainium so I agree with Stuart S.
Someone here somewhere sometime posted that JLR apparently claim that the special Castrol brew contains high levels of titanium and low levels of molybdenum (the opposite of almost all other fully synthetic low viscosity oils) because moly doesn't play nice with the Jag cat converters but titanium does.
I never quite believed this claim, the oil I use is high in moly and I have never had a cat converter problem.

I've been saying this for years. Also in these forums. I think also in this thread.

How about aftermarket warranties? I have a 6-year, 125,000 extended warranty I bought with my Jag last October through my Credit Union. I figured it would be nice to cover the vehicle during at least the time I have the loan. Not sure these extended warranty companies dig deep enough to research oil types. What do you think?

What you bought from your credit union is not a warranty, because a warranty is a guarantee by the manufacturer. You bought an extended service contract from a third party unrelated to the manufacturer, Jaguar. It's like an insurance policy, with definitions, coverages, deductibles, limitations, and terms and conditions.

You asked: "What do you think?" It doesn't matter what anyone thinks because the only thing that matters is the contract - the written document. Not the slick sales brochure that summarizes the contract or what anyone told you about it to persuade you to buy it. The language in the contract controls.

Your credit union sells this product because they make a good profit for very little work. And the underwriter (issuer) of this extended service contract also makes a good profit because they wrote the contract to deny claims, not pay them. They're pros in business to make money and have years of data to know how to do it. Read the full contractual document, in particular, the terms and conditions and limitations of coverage. It's just like a casino in Las Vegas - it's a gamble and sure, there are winners. But the house makes the rules and they always win. They let you win to get you hooked to keep you in the game. And it's good for business to let a few players occasionally hit the jackpot and tell everyone. That keeps more players coming back.

What you bought will help you sleep better ... until you file a claim.

To answer your question, I doubt that your contract specifies that you must use only Castrol Unobtainium, so any brand of high quality motor oil that meets or exceeds the Jaguar specs will suffice. Just be sure that you have all the receipts. The burden of proof is on you, so be prepared for an uphill battle.

Hopefully, you'll be a winner. The alternative is to deposit the cost of that extended service contract- let's say $5,000 - in a savings account to be used to pay for repairs. Odds are that you'll have a balance remaining after that contract expires.

Good luck!