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  #49  
Old 07-26-2015, 09:01 AM
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Re: Whats your choice of oil for your WK2?

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Originally Posted by billt View Post
I've read my manual. It clearly states to only use 5W-20 that meets Chrysler MS-6395 spec. I simply asked what, if any other brands of oils meet those weights and specifications, other than Pennzoil Platinum Full Synthetic. Not an essay from you bragging about what you think you know.
Valvoline in many viscosities meet it, 6395 spec, QS also meets it and some of the Castrol, Royal Purple has it on their bottles.

Have to look for the approval list.

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  #50  
Old 07-26-2015, 09:08 AM
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Re: Whats your choice of oil for your WK2?

5W-20, as the owner's manual states.
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  #51  
Old 07-26-2015, 09:18 AM
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Re: Whats your choice of oil for your WK2?

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Originally Posted by MDBones View Post
5W-20, as the owner's manual states.

Can you share brand? Thanks


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  #52  
Old 07-26-2015, 09:37 AM
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Re: Whats your choice of oil for your WK2?

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Originally Posted by Oblivion View Post
Can you share brand? Thanks
I don't make a big deal out of oil brand... whatever the dealer uses, which I haven't even bothered to ask.

My theory is that every brand today meets the basic standards set by the automotive industry if they want to be able to sell it.

Asking a question like this is like asking what brand of beer do you prefer... you're going to have answers all over the map. Everyone has an opinion on that as well.

In any case, it's not a big deal to me.
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  #53  
Old 07-26-2015, 11:00 AM
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Re: Whats your choice of oil for your WK2?

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Originally Posted by billt View Post
Your argument is both foolish and nonsensical. Overall 0W-20 has less viscosity than 5W-20. Why would anyone living in a high temperature climate choose an oil with LESS viscosity? It is also NOT recommended in the 2015 Jeep Grand Cherokee owners manual, and 5W-20 IS. There is not a single reason you could possibly come up with, that makes any sense what so ever, why I would choose to substitute such a product.

A 0w-20 and 5w-20 are the same viscosity at operating temperature, the 0w-20 will generally flow easier at subzero temps. Also in general the
0w-20 will have better base oil than 5w-20.

Also you do realize in the 2011 Police Upfitters book, they recommend 10w-30 Mobil 1 for the squads equipped with the Hemi for warranty.
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  #54  
Old 07-26-2015, 11:04 AM
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Re: Whats your choice of oil for your WK2?

I don't doubt that several different weights meet the Chrysler MS-6395 spec. With that said, only 5W-20 is recommended in the 2015 Jeep Grand Cherokee owners manual for the 5.7 HEMI V-8.
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  #55  
Old 07-26-2015, 11:05 AM
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Re: Whats your choice of oil for your WK2?

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Originally Posted by Turbozcs2003 View Post
Also you do realize in the 2011 Police Upfitters book, they recommend 10w-30 Mobil 1 for the squads equipped with the Hemi for warranty.
That may be true for Police vehicles with HEMI's in 2011. But not for Grand Cherokee's in 2015. These type of things are constantly changing. Again, the 2015 Jeep Grand Cherokee Owners Manual states ONLY 5W-20 motor oil that meets Chrysler MS-6395 should be used in the 2015 Grand Cherokee with the 5.7 HEMI....... No other weight.


Would it hurt the engine to use 0W-20? Perhaps not, but why would you when you can just as easily use what's recommended?
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  #56  
Old 07-27-2015, 04:40 AM
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Re: Whats your choice of oil for your WK2?

Because bill you are blinded by a manual that is written for dummies. Heck the manual even states you can use a 30w if you like. As per the manual as long as it meets specs. Maybe you should get out of your box and actually trust those in the trade. i already said my dealer uses the same oil as i. Go figure i guess they are wrong also.
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  #57  
Old 07-27-2015, 07:06 AM
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Re: Whats your choice of oil for your WK2?

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Originally Posted by nicjak View Post
Because bill you are blinded by a manual that is written for dummies.
So you think you know more than the engineers that designed and tested the engine? And you still haven't answered the question as to why I should be using a oil with LESS viscosity, (0W-20), than the manual recommends, just you..... When I live in the DESERT? Typical liberal. Zero common sense.
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Old 07-27-2015, 07:48 AM
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Re: Whats your choice of oil for your WK2?

Chrylser MS-6395 is many specifications.
There is seperate requirments for 0w-20 and 5w-20

Just because it meets MS-6395 does not mean it's the correct oil.

0w-20 is probably fine but may void warranty. Highly unlikely to verify though.

Manual is pretty clear it strongly recommends 5w-20 AND that it meets MS-6395.

Also the wider range the more modifiers are needed.
So they take a thinner base and add modifiers to bring it up to 20.

So there are benifits to running 5w20

Straight 30 is arguably better than 5w30.

Also each brand decides what label to put on bottle.
One brand might label the similar behaving oil 5w-20 another might call it 0w-20
The behavior oil is more complex than just this overall label.

Oil changes quite a bit as it ages which will vary with brand due to different modifiers.
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  #59  
Old 07-27-2015, 08:56 AM
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Re: Whats your choice of oil for your WK2?

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Originally Posted by mswlogo View Post
Chrylser MS-6395 is many specifications.
There is seperate requirments for 0w-20 and 5w-20

Just because it meets MS-6395 does not mean it's the correct oil.

0w-20 is probably fine but may void warranty. Highly unlikely to verify though.

Manual is pretty clear it strongly recommends 5w-20 AND that it meets MS-6395.

Also the wider range the more modifiers are needed.
So they take a thinner base and add modifiers to bring it up to 20.

So there are benifits to running 5w20

Straight 30 is arguably better than 5w30.

Also each brand decides what label to put on bottle.
One brand might label the similar behaving oil 5w-20 another might call it 0w-20
The behavior oil is more complex than just this overall label.

Oil changes quite a bit as it ages which will vary with brand due to different modifiers.

Thank you for your feedback! It does make sense to use the oil specified by manufacturer. It would seem arrogant to pretend to know more about what oil to use in your car against the collective knowledge and intentions of the manufacturer. Then again we are all free to our own choice!
Obviously, a -w-20 oil meeting MS-6395 specs is your target at the widest range of its operating environment, but assuming non-recommended cold start specs would be better than recommended for what ever reason seems childish, no matter how minuscule the difference between a 0w and 5w is, which I can only guess is too small; non consequential during field applications that vary. You could possibly argue that 0w is only much different from say 30w or 60w (which I believe is the other end of the scale on cold start performance), but not that much if compared to 5w.

Different is not always better!


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Old 07-27-2015, 09:02 AM
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Re: Whats your choice of oil for your WK2?

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Originally Posted by nicjak View Post
Because bill you are blinded by a manual that is written for dummies. Heck the manual even states you can use a 30w if you like. As per the manual as long as it meets specs. Maybe you should get out of your box and actually trust those in the trade. i already said my dealer uses the same oil as i. Go figure i guess they are wrong also.
The whole premise behind any owner's manual is that it's basically written for dummies. It's a CYA thing for both the product manufacturer and consumer. From the consumer standpoint, if you deviate from what's recommended it's a pretty safe bet the manufacturer can/will use that against you if a warranty issue arises.

Looking at the MY14 owner's manual it states...

Engine Oil Viscosity - 3.6L and 5.7L Engines

MOPAR® SAE 5W-20 engine oil approved to Chrysler Material Standard MS-6395 such as Pennzoil®, Shell Helix® or equivalent is recommended for all operating temperatures. This engine oil improves low temperature starting and vehicle fuel economy.

FOR 3.6L NOTE: MOPAR® SAE 5W-30 engine oil approved to Chrysler Material Standard MS-6395 such as Pennzoil®, Shell Helix® or equivalent may be used when SAE 5W-20 engine oil meeting MS-6395 is not available.

FOR 5.7L 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 Fuel Saver Technology. Refer to “Fuel Saver Technology – If Equipped” in “Starting and Operating” for further information.

Synthetic Engine Oils - 3.6L and 5.7L Engines

You may use synthetic engine oils provided the recommended oil quality requirements are met, and the recommended maintenance intervals for oil and filter changes are followed.

Materials Added To Engine Oil - 3.6L and 5.7L Engines

The manufacturer strongly recommends against the addition of any additives (other than leak detection dyes) to the engine oil. Engine oil is an engineered product and its performance may be impaired by supplemental additives.

Edited to add...

It appears this is being driven in large part due to these being E85 flex fuel engines.

Selection Of Engine Oil For Flexible Fuel Vehicles (E-85) And Gasoline Vehicles

FFV vehicles operated on E-85 require specially formulated engine oils. These special requirements are included in MOPAR® engine oils, and in equivalent oils meeting Chrysler Specification MS-6395. The manufacturer only recommends engine oils that are API Certified and meet the requirements of Material Standard MS-6395. MS 6395 contains additional requirements, developed during extensive fleet testing, to provide additional protection to Chrysler Group LLC engines. Use MOPAR® or an equivalent oil meeting the specification MS-6395.
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