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Dunecrawler 02-23-2011 08:36 AM

I just got my Overland back from the dealer after 10K service. They used 5W40 synthetic oil.
I asked why not 5W20 and they said they use 5W40 on all the Jeeps and that it was better anyway.
My question is this...I am sure I read that the MDS very specifically needs 5W20. How true is this and does anybody know of a specific instruction from Jeep to ONLY use this?
How do I convince them? Write to Jeep in the US and get them to send me something in writing maybe?
I don't even want to think about what they will use in the diff's, TC and transmission.

bosca418 02-23-2011 08:42 AM

Re: 5w25
The manual says to use 5w20.

swampass2 02-23-2011 08:51 AM

Re: 5w25
Page 489 of the latest US Owner's manual says:

"NOTE: Vehicles equipped with a 5.7L engine must use
SAE 5W-20 oil. Failure to do so may result in improper
operation of the Multiple Displacement System (MDS).
Refer to “Multi-Displacement System” in “Starting and
Operating” for further information."

Dunecrawler 02-23-2011 08:59 AM

Re: 5w25
Sorry. I meant 5W20, but I have since shown them the manual and they insist that 5W40 is "better"

bosca418 02-23-2011 09:02 AM

Re: 5w25
That would make me uneasy. The manual clearly states to use 5w20. This being a new rig and all have they worked on the new jeeps before? Are there quite a few 2011's in Dubai?

franco1961 02-23-2011 09:15 AM

Re: 5w25
use the 5W20
5W20 the viscosity range is narrow, 15 points
wiki helps to understand

Dunecrawler 02-23-2011 09:16 AM

Re: 5w25
Not that many WK2 yet, but it has been on sale since October last year. I had a 2006 5.7 Overland and that also needed 5W20, but I just did the services myself. Can't do that with this one though because of the warranty.
The level of competence and training here is in general a problem, not only from Jeep.
BTW, they also insist on doing the services at 10 000 kms instead of the 12K as the manual says.

Dunecrawler 02-23-2011 09:22 AM

Re: 5w25

Originally Posted by franco1961 (Post 362400)
use the 5W20
5W20 the viscosity range is narrow, 15 points
wiki helps to understand

Thanks for the link, but I understand the viscosity grading. Obviously they don't, as their response was just that 5W40 is a better oil.

mjw930 02-23-2011 09:29 AM

Re: 5w25

Originally Posted by Dunecrawler (Post 362386)
Sorry. I meant 5W20, but I have since shown them the manual and they insist that 5W40 is "better"

It's quite simple, THEY ARE WRONG! Insist that they follow the manual or provide you with a lifetime, unlimited, no deductible warranty to cover you when their arrogance breaks your machine.

franco1961 02-23-2011 09:30 AM

Re: 5w25
5W40 will dont destroy your engine.
But is out of specs for it.
You are the owner of the car and even they will change the oil for free You must ask to use the right one.
May be they just have a huge can of 5W40 and they use no matter diesel, gasoline, motorbike, boats etc etc.
But as long they are able to read the numbers and just one letter ask them to read
Worst case You can send mail to Jeep factory claiming Your rights about, and asking to push the garage to do as You ask, but than You need forget this dealer forever.

Polak 02-23-2011 09:31 AM

Re: 5w25
Is it hot in Dubai? That may be a reason why they use a thicker oil.

Dunecrawler 02-23-2011 09:33 AM

Re: 5w25
Yeah. Good idea, but it is not that easy to convince an ignorant fool. These people are NEVER wrong.

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