I had my XKR-S in for annual service and noticed that the dealer used 0W-20 Castrol EDGE oil instead of the 5W-20 Castrol SLX.

I questioned the change and the dealer told me.

We use only the recommended grade on your vehicle

George Kontogonis
Service Advisor
Decarie Motors Inc., 8255 Bougainville, Montreal, Quebec H4P 2T3


Anyone else have the type of oil changed??? I am trying to find out from Jaguar if this legit or is the dealer trying to pull a fast one??

 

FWIW....

Some Googling suggests the 'SLX' is discontinued and replaced by 'Edge'. I didn't dive deeply into the subject, though, to confirm.

But....

If you go the the Castrol main web site there is no mention of 'SLX' at all.

Cheers
DD

 

0W and 5W are difference weights. Most good mechanics will use a thinner oil in the winter and thicker in summer.

 

Well the dealer Fixed Operations Manager contacted me and sent me this service bulletin

In response to your recent service visit, you indicated that you were unsatisfied with the reply regarding the use of Castrol’s 0W-20 Edge Professional oil.
I have attached a copy of a product memo from Castrol regarding this new oil which was developed for the newer engines.
Due to restricted tolerances in the modern engines, Castrol has developed this oil to meet the demands required.
Additionally, since the “0” rating allows for less engine friction when cold (and at colder temperatures), it is suitable for older engines that do not have the same tolerances and the newer ones.

 

Ahhh- Decarie Motors, my 'favourite'

If 0W-20 is an acceptable viscosity for the coming season, you're all set.

 

Except I only drive the car in the summer months

 

Your dealer obviously changed the oil with Canadian winter driving in mind. Did you make it clear that you drive the car only in the summer ? You should NOT drive the car in summer with this oil - it is much too light . There is no mention in the Castrol specification for this 0W oil that it can be used in warmer ambient temperatures.

 

Now that I look at it, the owners manual makes no reference to use of any 0W-20 oil and gives no options to 5W-20.

 

<You should NOT drive the car in summer with this oil - it is much too light.>

Nonsense. You do realize that oil gets thicker, not thinner, as it reaches operating temperature right? And that the question is 0-20W versus 5-20W?

The only difference with these two oils is that one is slightly thinner when starting the car... no need for worry at all you'll be fine. Many of the newer cars have opted for this viscosity as it seems to give slightly better fuel economy.

 

Well, ignoring your rather abrupt beginning, I confess that I might be just a bit behind the curve. I am fully aware that a viscosity rating of 0W20 and one of 5W20 operate the same way in hot conditions - having owned 30 Jaguars and doing the oil changes myself has prompted an awareness! And I also know that the engine in question is the 5 litre version.
The 4.2 litre engine specification is for 0W30 oil for conditions from -35 to +35 Centigrade (-31 F to +95 F). And if you live in Montreal or Calgary, this would be the proper choice. But if you live in Vancouver or Victoria a more appropriate choice would be the 5W30 which the XK owner's manual lists as "preferred"...and if you drive in areas where summer temperatures can get beyond 35 centigrade or 95 F (and up to 122 F or 50 C.), then the recommended grade is 5W40 for this engine (and I have driven my Jags hard and fast quite often in temperatures over 100 F. - so this is not a minor consideration). In other words the manual for the 4.2 litre engine gives a range of viscosities to suit different conditions.
Here is where I may be mistaken: does the 5 litre owner's manual specify 0W20 for ALL ambient temperature conditions - right up to and BEYOND 35 C and 95 F?

 

I assume handbooks specify an oil weight because that is what the consumer mainly looks at when they buy oil. The Jaguar Vehicle Specification Guide and facelift X150 Workshop Manual just specify Jaguar WSS–M2C925–A, with no difference for seasons.

The Castrol oil used by the dealer meets those specifications so to be fair they are just following Jaguar recommendations.

 

Here's what the owners manual says:

"Use only Castrol 5W-20 engine oil, meeting specification
WSS M2C925-A"

That's it.

 

Actually what is says is" only use Castrol 5W-20 SLX"

 

Mine says the same 5W-20 and it is also printed on the oil fill cap.

 

Unfortunately, the followup bulletin is a pdf in graphic format so the text cannot be
pasted here.

However, it clearly says that the 0W20 is also suitable and meets the specification for
those engines where the 5W20 was specified.

And then, there is freedom of choice.

 

@Zach,

It is not a good idea to publish someone else's email address on public
forums. They'll get a *lot* of spam once the spambots scrape the address.

You probably still have time to edit the post to remove the email address.

++

 

Keep in mind that the 2013, 2012, 2011, & 2010 owners manuals were written years ago when the Castrol SLX 5w20, 5w30 weights were recommended.

Appears that modern oil technology supercedes or replaces that old oil with the new "Edge" Castrol oil. Appears the Jag dealer replaced the old SLX with the new Edge oil, was appears correct.

Doubtful you would be able to find the Castrol SLX unless an oil vendor has some available, and would be considered as old oil. Castrol "Edge" is their high performance oil.

 

FWIW, the 2015 UK XK owners manual says:

SAE 0W-20 engine oil meeting Jaguar Land Rover specification STJLR.51.5122 should be used.

The 2014 UK XK owners manual says:

SAE 5W-20 engine oil meeting specification WSS-M2C925-A. If unavailable, SAE 0W-20 engine oil meeting Jaguar Land Rover specification STJLR.51.5122 may be used.

 

Just had mine serviced and 1 litre of Castrol 5W-20 left in car.

 

Funny as I ran 20W-50 in my old Ferrari and that was in the manual. Oh and it was dino not syn. Technology , technology , technology. I would go with either one as it shouldn't make any difference. Was there ever a TSB for the 5.0 to go from 5W-20 to 0W-20.