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Old 07-13-2013, 01:05 PM   #1
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What is best oil weight for 3.6 in 100 degree temp?

2013 Rubicon. What is best oil weight to use in Houston with 100 degree temps? Book says 5w20 as only choice.

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Old 07-13-2013, 01:09 PM   #2
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5W30. Pick a good shear-stable one. Pennzoil makes the yellow bottle, Platinum, and Ultra. Great oils. Valvoline is good too, as is Mobil 1.

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Old 07-13-2013, 01:23 PM   #3
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Okay thanks. I have 3100 miles on jeep. Should I be waiting for an oil change light to come on before changing?
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Old 07-13-2013, 01:28 PM   #4
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No need. If you are under warranty, do call the dealership and make sure this is ok. There has been no change to the motor but dealerships will use any excuse to get out of a fix. The 5W20 was chosen to increase fuel economy and raise their average across the Chrysler line. If they say you must use 5W20, just use a very shear-stable one. I would use a Pennzoil synthetic. They also meet Chrysler spec (more of a formality). In fact, the Jeep dealership usually carries a semi-syn Pennzoil that is impossible to find anywhere else. It is a very good oil.
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Old 07-13-2013, 02:48 PM   #5
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Originally Posted by shanersrvn View Post
2013 Rubicon. What is best oil weight to use in Houston with 100 degree temps? Book says 5w20 as only choice.
WOW, do we have the making of a oil WAR? I sure hope that we do, because they are great..................
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Old 07-13-2013, 02:58 PM   #6
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I don't really know that much about oils etc but I wouldn't think a special oil would need to be used in hot temperatures. When running its going to be around 160 degrees from what I've read anyway. Unless your in some extreme heat I don't think your engine will be running any more hot than usual.

I would see needing to change something for extreme cold because of starting the engine while its cold.

Just my 2 cents
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Old 07-13-2013, 03:02 PM   #7
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I use any full syn 5w30 that's on sale.....penz, QS, Mobil 1,Valv, ect
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Old 07-13-2013, 03:07 PM   #8
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Originally Posted by HK_Runner View Post
5W30. Pick a good shear-stable one. Pennzoil makes the yellow bottle, Platinum, and Ultra. Great oils. Valvoline is good too, as is Mobil 1.
For the 2013 3.6, the recommended is 5w20.
Synthetics maybe used. Mobile 1 is not recommended by Chrysler/Jeep!
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Old 07-13-2013, 04:32 PM   #9
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5w-20 synthetic works perfectly.

Trying to outsmart auto and petroleum engineers is pointless.
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Old 07-13-2013, 04:44 PM   #10
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The main goal of 5W20 is fuel economy..even the manufacturers will admit to this. M1 actually had the chrysler spec- they had a spat, and M1 stopped carrying the spec on the bottles. The oil is still exactly the same.

Here is a tidbit- Jeep specifically warned European Compass and Patriot owners to not use 5W20 after doing the initial drain. It simply was not providing the protection needed in some engines.

So basically 5W30 provides slightly better protection and 5W20 provides slightly better fuel economy. Use what you want. I have only see two shear-stable 5W20s, and I don't plan on using any.

Using 5W20 will not void your warranty...it is the same engine that called for 5W30 a year ago before they needed some help for the CAFE fuel economy requirements. Toyota did the same thing. Their led techs also (I also know the Lexus Svc Mgr) said it is for fuel economy and recommended I stick with 5W30 in my V8 4Runner. Call Chrysler and ask them (a monkey rep will tell you to use what is on the cap...try to get to someone above that) but do use 5W20 if you're worried.


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For the 2013 3.6, the recommended is 5w20.
Synthetics maybe used. Mobile 1 is not recommended by Chrysler/Jeep!
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Old 07-13-2013, 04:51 PM   #11
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Maybe we can beat this oil post to death like most of the others. My Jeep dealer uses Mobil 1 10w-30 unless you ask for something else. There is nothing you can do to your jeep my dealer will not fix under warranty. I have seen him replace drive shafts even knowing the guy went to high with his lift and destroyed the drive shaft.
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Old 07-13-2013, 05:54 PM   #12
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Originally Posted by shanersrvn View Post
2013 Rubicon. What is best oil weight to use in Houston with 100 degree temps? Book says 5w20 as only choice.
What does your manual state? Go with the manual, keep your warranty intact.
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Old 07-13-2013, 07:12 PM   #13
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Make sure the oil you choose meets the Chrysler specs and make sure to keep your receipts.
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Old 07-13-2013, 07:17 PM   #14
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In an perfect world you would use 5-30 but have receipts that reflect 5-20 so not to risk a warranty issue and it is a fact being this is a Chrysler product that you will have to use your warranty so best not give them a reason to deny a claim.
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Old 07-13-2013, 07:23 PM   #15
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Amsoil... there is no substitute. 5w30. Now..... LETS GET IT ON!!!
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Old 07-13-2013, 10:33 PM   #16
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Side question about synthetic....can I switch to synthetic after I have gotten my normal oil changes from the dealer? What's the benefit?
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Old 07-14-2013, 08:01 AM   #17
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Amsoil...
No oil thread is allowed to exist without someone coming in and saying this. I think the universe would implode if it were to ever happen.



Carry on
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Old 07-14-2013, 08:47 AM   #18
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Stick with the recommendation for your year, regardless of climate. Remember, the engine oil is like blood, its the absolute core of your engine. If you mess with it then Chrysler will be able to blame any engine-related problem on you and void your warranty.
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Old 07-14-2013, 10:25 AM   #19
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Stick with the recommendation for your year, regardless of climate. Remember, the engine oil is like blood, its the absolute core of your engine. If you mess with it then Chrysler will be able to blame any engine-related problem on you and void your warranty.
X2, this........^..........
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Old 07-14-2013, 11:39 AM   #20
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What the heck is shear-stable oil?
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Old 07-14-2013, 12:04 PM   #21
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No oil thread is allowed to exist without someone coming in and saying this. I think the universe would implode if it were to ever happen.



Carry on
I know... I wanted to be the one who said it first this time. I was tryin to be funny.
I don't run amsoil in my street rig its just too darn expensive to change every 3k.
I have a friend who builds competition rock crawlers and he swears by it. The did an experiment where they ran 2 buggies upside down and the one with amsoil in it made it 5 min longer than Mobile 1. Its good stuff. I couldn't afford it because my 08 burned as much oil as it did gas. My new '12 seems to be better but I have the premium maintenance plan that includes oil changes for 4 years. Cant pass that up.
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Old 07-14-2013, 03:50 PM   #22
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What the heck is shear-stable oil?
Some oils mainly conventional will shear down in weight over time.
Example: you start out with a 5w30 conventional oil and after about 2000 miles, you wined up with 5w20. It depends on the oil as too how fast it will shear down "reduce itself to a lesser weight". After talking directly to Shell oil, my understanding from them is that all oils will shear down in time, but that the Synthetics are much more stable. So in answering your question, synthetic oils are pretty much shear-stable!

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