Jeep Wrangler Forum banner

1 - 20 of 34 Posts

·
Registered
Joined
·
347 Posts
Discussion Starter #1
I know that I am very challenged when it comes to anything mechanical.
But we are talking SAME engine. What's up with that ?

Pentastar 2012 - recommended oil is 5W-30
Pentastar 2013 - recommended oil is 5W-20

Are they for real ?
Can someone explain why the difference ? Makes no sense to me.
 

·
Registered
Joined
·
197 Posts
I know that I am very challenged when it comes to anything mechanical.
But we are talking SAME engine. What's up with that ?

Pentastar 2012 - recommended oil is 5W-30
Pentastar 2013 - recommended oil is 5W-20

Are they for real ?
Can someone explain why the difference ? Makes no sense to me.
I believe the change is driven by CAFE standards.

I'd love to see some UOA's to see which viscosity is actually better for the engine.
 

·
Registered
Joined
·
347 Posts
Discussion Starter #3
I believe the change is driven by CAFE standards.

I'd love to see some UOA's to see which viscosity is actually better for the engine.
Exactly my thoughts.
If they changed their mind within two years for the same engine, there got to be the reason why.
Does that mean 5w-20 is better for that engine ?
 

·
Registered
Joined
·
197 Posts
Does that mean 5w-20 is better for that engine ?
Not necessarily. It might get slightly better MPG and Jeep needs all the help they can get to meet CAFE.

I've also heard of slightly better heat dissipation with the thinner oil which might help with cylinder head problems.

I'm on the fence as to which viscosity to use when I do my first oil change.

I wonder if Jeep even switched to 5W-20 as the factory fill for '13. Maybe they just changed the oil cap and owner's manual and used up their stockpile of 5W-30.
 

·
Registered
Joined
·
632 Posts
Generally speaking 5w-20 provides slightly less protection but slightly better fuel economy. If I had a 2013, I'd stick with 5w-30. However, the chance of an engine failure using 5w-20 is extremly slim. Maybe at the 300,000 mile mark, if that.

The same switch happened in my wife's Town and Country. She has the old 3.3 engine (cousin of the 3.8 in the 07-11 Wrangler!). Was 5w-30 for years, but in her 2009, they switched it to 5w-20 for CAFE standards.

Check out the website bob is the oil guy if you want to go cross eyed reading about viscosity and all things oil.
 

·
Registered
Joined
·
347 Posts
Discussion Starter #7
Just use Red Line 5W-20 Syn. "Bob is the oil guy" lists it as his favorite 30 weight synthetic - 30 wt. because it is "very thick" for a 20 wt. :thumb:

Motor Oil 106 - Bob is the Oil Guy
Bill, I never used Red Line.
I've been with Mobil 1 for the last 10 years.
Apparently you are happy with it ?
Is it readily available ?
Did you do any research and see any test results of Red Line ?
Thanks !!
 

·
Registered
Joined
·
243 Posts
Remember M1 is does not meet Chrysler specs MS-6395. I'll use Pennzoil Ultra 5W-20 full syn as it is on the approved list.
 

·
Registered
Joined
·
899 Posts
I just had my oil changed at the dealer. I have a 2012 JKU Sahara purchased 5/1/2012. The 1st 4 oil changes are free. I asked the service rep. about this and he said "we use what is written on the oil cap".

It is weird that it was changed for Model Year 2013 but to maintain my warranty I too will use what is recommended in the owner's manual on what is on the oil cap.

Unless Fiat Chrysler Jeep writes me to amend my warranty to change oil, I won't.
 

·
..shall not be infringed!
Joined
·
4,666 Posts
Bill, I never used Red Line.
I've been with Mobil 1 for the last 10 years.
Apparently you are happy with it ?
Is it readily available ?
Did you do any research and see any test results of Red Line ?
Thanks !!
Nope. Haven't used it. I just had noticed Bob-is-the-oil-guy's recommendation for it as a 5W20 that is more like a 5w30.

[Edit: this might help: Red Line Synthetic Oil ]

I use Mobil 1! Switched to it at 4500 miles. (Oh, the horror, my warranty will be voided...... NOT)

I. like you, am curious about the real reason for the change from 5W30 in the 2012, to 5W20 for the exact same 3.6L in the 2013 JKs.
 

·
Registered
Joined
·
243 Posts
Nope. Haven't used it. I just had noticed Bob-is-the-oil-guy's recommendation for it as a 5W20 that is more like a 5w30.

[Edit: this might help: Red Line Synthetic Oil ]

I use Mobil 1! Switched to it at 4500 miles. (Oh, the horror, my warranty will be voided...... NOT)

I. like you, am curious about the real reason for the change from 5W30 in the 2012, to 5W20 for the exact same 3.6L in the 2013 JKs.
I was merely pointing out that M1 is not on the Chrysler approved list. I like it a lot but won' t use it in the Jeep until it says it meets specs. I know it does but Mobil has to prove it to Chrysler. So I' m go ing with Pennzoil Ultra.
 

·
Registered
Joined
·
873 Posts
Nice to see this topic boomerang. Actually read the "bob" site...it'll basically explain to you that within the vehicles normal operating range the working viscosity between 20W and 30W oil is not going to significantly affect protection. What WILL matter is the lubricity of the oil (which is not the viscosity, thus the two different words), the additive package and how effectively your engine circulates the oil.

You could have oil made of unicorn tears and adamantium flakes...if it's too thick to flow effectively in your engine, it won't be as good as a thinner oil that flows properly made from orc blood.
 

·
Registered
Joined
·
293 Posts
Remember M1 is does not meet Chrysler specs MS-6395. I'll use Pennzoil Ultra 5W-20 full syn as it is on the approved list.
From M1's website
http://www.mobiloil.com/USA-English/MotorOil/Car_Care/AskMobil/Mobil_1_and_Chrysler_MS-6395.aspx
Question:
Mobil 1 5W-20 and Chrysler MS-6395
Why is your Mobil 1 5W-20 not Chrysler MS-6395 spec approved? Or if it is, why is the certification not on the bottle or website?
-- Josh Eads, Cabot, AR

Answer:
Chrysler’s latest revision to the MS-6395 specification calls for a field trial spanning multiple seasons over two years. While we fully expect the exceptional performance of Mobil 1 synthetic motor oil to meet Chrysler’s specification requirements, at this time we are in the process of evaluating our timeline to start this testing
.
 

·
Registered
Joined
·
227 Posts
Pretty lame response by Mobil 1. Not sure why they are willing to loose sales for so many Chrysler vehicles. Time to step up. Castrol, Pennzoil, Quakerstate, and Valvoline conventional oils can do it you'd think Mobil 1 would try a little harder. While they are evaluating their timeline to start this testing, I'll evaluate my timeline to not buy their product.
 

·
Registered
Joined
·
462 Posts
I just had my oil changed at the dealer. I have a 2012 JKU Sahara purchased 5/1/2012. The 1st 4 oil changes are free. I asked the service rep. about this and he said "we use what is written on the oil cap".

It is weird that it was changed for Model Year 2013 but to maintain my warranty I too will use what is recommended in the owner's manual on what is on the oil cap.

Unless Fiat Chrysler Jeep writes me to amend my warranty to change oil, I won't.
Did you check the receipt that it said 5W30?
The dealer I went to (and where I bought it) used 5W20 and ignored my complaint about they didn't follow the manual and oil cap. Now, I do oil change myself.
 

·
Registered
Joined
·
8,968 Posts
I just had my oil changed at the dealer. I have a 2012 JKU Sahara purchased 5/1/2012. The 1st 4 oil changes are free. I asked the service rep. about this and he said "we use what is written on the oil cap".

It is weird that it was changed for Model Year 2013 but to maintain my warranty I too will use what is recommended in the owner's manual on what is on the oil cap.

Unless Fiat Chrysler Jeep writes me to amend my warranty to change oil, I won't.
The dealer I go to now uses 5W30 for all JK oil changes. You can't be denied a warranty claim based upon whether or not you use what's listed on the cap or in the manual.
 

·
Super Moderator
Joined
·
23,655 Posts
Pretty lame response by Mobil 1. Not sure why they are willing to loose sales for so many Chrysler vehicles. Time to step up. Castrol, Pennzoil, Quakerstate, and Valvoline conventional oils can do it you'd think Mobil 1 would try a little harder. While they are evaluating their timeline to start this testing, I'll evaluate my timeline to not buy their product.

they are banking on the fact that 99% of the people who drive chryslers don't check the bottle for the ms 6395 requirement or even know there is a ms 6395 requirement. I know it slipped by me and if not for this thread would not have thought twice about using it. Now if pennzoil and the other companies who meet the specs would start advertising that mobil1 does not meet specs for chrysler cars I bet mobil would get on the ball.
 

·
Registered
Joined
·
136 Posts
I was wondering the same thing. I bought a 2012 earlier this year. My wife liked it soo much I got her a 2013 JKU. I change oils at the same time and noticed the change. I was wondering which one to use. I called the dealer and the guy said to just use what is written on the fill cap:banghead:
 
1 - 20 of 34 Posts
Top