I just left the dealership and realize the manual says 5w-30 but they put 10w-40 did they put the wrong oil ?

 

Anyone ?

 

I would say it is unlikely to make much difference except in extremis. This means at the outer envelope of performance.

So.... Do you explore the full performance envelope of the car ? I would guess not, but I may be wrong

 

I've been warned to only use the recommended 5W-30 in both of my 4.2 Jag V8s because the crankcase ventilation system is kind of sensative. Don't know how true that is, but it's my $0.02 worth.

 

This is crazy so is the dealer right or wrong ?

 

You might try re-posting on the General Tech Help forum. Maybe one of the Techies will see it there sooner than here. Good luck.

 

I am not sure what dealer you are speaking of but if it is a Jaguar dealership I would pose the question to them. At times age, mileage and environmental temperatures will often dictate the proper oil to use along with what the manufacture is recommending. I will also provide you with a link to do a little reading about oil http://www.bobistheoilguy.com/cms/ I hope this helps. The wrong oil is not necessarily doom and gloom.

 

Perhaps neither.

I am not really familiar with the later models but manufacturers *usually* have a suggested viscosity for general use but allow that a *range* of different viscosities are acceptable.

I take out the owner's manual and see what it says. If the 5/30 recommendation is written in blood and illustrates an errant owner blindfolded in front of a firing squad, I'd go back and ask for a fresh oil change.

If the 5/30 is more of a suggestion than a commandment, well...you get the idea.

Cheers
DD

 

The manual doesnt mention anything about using 10w-40. I am still concerned about this.

 

I don't know what MY you have but the manual for my 98 XK8 lists 5w-30, 10w-30, and 15w-40....it also says "To choose the correct viscosity grade, consider the temperature in which the vehicle is driven. The use of SAE 5W/30 is PERFERRED in most climate conditions, although SAE 10W/30 or 15W/40 oils are acceptable in moderate to hot climates."

 

Technical Service 10-100 bulletin allows the use of a range of oils from 5w/40 to 15w/50. It includes 10w/40. The oil must be synthetic though.

 

The oil they used was not synthetic it was dino oil. Should I be concerned ? My MY is 2004 XKR.

 

IMHO, yes.

Not wringing-my-hands-with-worry concerned, mind you. But I'd want the correct spec oil, personally.

It'll cost ya more, though.

Cheers
DD

 

Can a tech confirm this to give me a clear understanding ?

 

I am not a tech but, If you are that upset about it take it back and tell them to change the oil!

 

If the dealer uses this oil routinely then it is almost certainly OK. Change to synthetic at the next service.