I know but I am a noob. 2020 JT oil weight.

Joey1313

Joey1313

Caught the Bug
I know this has been internetted to death but what are y'all running. I know tolerances have changed through the years but..... Not looking to solve the mystery, just looking for honest opinions.

I will need to do my first soon. Has 45,000 miles. No idea what previous owner used.
 
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Ddays said:
Doesn't matter what brand was used before either- run what you like best. And run whatever it says in the manual. Internet engineers never built anything...
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While true, today's owner manuals are heavily influenced by CAFE standards. Only the oil weight used in gov't testing to achieve the mpg rating can be recommended in the manual.

Note: I am not saying to go against the manual here, if that's what you think is best.

-----

The following may go against popular opinion, so:
**Flame Suit on**

Just saying that there's a wider spread of viscosities that can be safely used.

Example: we have a Jeep JL and a Toyota FJ.

FJ recommends 0w20 in the US, but everywhere else in the world can go up to 20w50, depending on expected minimum temperature. Toyota's manual even says that for heavy usage - towing, mountains, high speed etc, a thicker oil "may be a better choice"...but they can only mention 0w20 in the manual because of CAFE regulations.

In the Jeep 2.0T, manual says 5w30. But in this Stellantis engine in Europe, heavier oils are allowed.

For both, I run 0w40 winter and 10w40 summer with zero issues, and no loss of power or mpg.

I realize neither is the Pentastar 3.6; however for that engine I'd likely use at least a 5w30 - that was the original specification although there have been changes made to the design.

Some that "go against the manual" use the specified oil during warranty and switch later. Some switch when they get home from the dealer.

You certainly can't go wrong with the owner manual specification; but for myself, I choose to use a thicker oil - one that's specified or allowed for the same engine in other parts of the world.

I'm also speculating that with the new laws coming out relaxing mpg requirements and possibly doing away with the stop/start nonsense, that we may see heavier weight oil recommendations coming back to the owner manuals.
 
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www.wayalife.com

WHO DO YOU TRUST : Owners Manual or The Internet

When it comes to servicing your Jeep, who do you trust? Jeep and what they say you should do and use as stated in the Owners Manual and in order to maintain your powertrain warranty OR... the "some" on the internet who have ideas of their own? Please note, this is a sincere question and I ask it...
www.wayalife.com www.wayalife.com

I don't know how any of survived before the internet.
 
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Here's another post that I think is worth a read too and you can take it for what it's worth.
Gossamer JL said:
As a guy that works in the refined oil and lubrication industry, please take this with the utmost respect. And I am not trying to act like a know it all here.

DO NOT CHANGE THE VISCOSITY OF THE OIL YOU ARE PUTTING IN YOUR ENGINE.

That recommendation is set by the manufacturer for good reason and because it is the viscosity needed to lubricate your engine properly.

It is the proper lubrication for your engine for specific specs and operations:

gear clearances,
pressure targets,
hydraulic lifters and cam phases,
piston lubrication,
piston cooling jets,
fuel economy,

and much more when it comes to your engine.

Modern engines are engineered around very specific oil flow, pressure, and temperature characteristics. Deviating from the specified viscosity without a valid reason can negatively affect lubrication, oil pressure, component operation, and long-term engine durability.
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Jeep JL 3.6 oil

I own a 2020 Jeep JL with the 3.6. I see in some YouTube videos, some people recommend changing the viscosity of the engine oil to 5W30. What is the general consensus on doing this for better engine wear? At present I only have 15,000 miles on it.
www.wayalife.com www.wayalife.com
 
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wayoflife said:
Here's another post that I think is worth a read too and you can take it for what it's worth.

Jeep JL 3.6 oil

I own a 2020 Jeep JL with the 3.6. I see in some YouTube videos, some people recommend changing the viscosity of the engine oil to 5W30. What is the general consensus on doing this for better engine wear? At present I only have 15,000 miles on it.
www.wayalife.com www.wayalife.com
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Yup.

But what about overseas owner manuals for the same engine that specify heavier weight oils?

And CAFE vs engineer recommendations... you said you know some high level guys at corporate...what's their take?
(Not fighting...just seeking information & attempting intelligent discourse online LOL)

🤷
 
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JLTD said:
Yup.

But what about overseas owner manuals for the same engine that specify heavier weight oils?

And CAFE vs engineer recommendations... you said you know some high level guys at corporate...what's their take?
(Not fighting...just seeking information & attempting intelligent discourse online LOL)

🤷
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What is gained by going against manual recommendations? Anything of significance? 50 extra horsepower? 100k more miles of life? 10 more mpg? No, and in the end who really cares that much about engine oil viscosities? Run what the manual says and call it good.

Now, if someone really wants to be helpful, mosey on over to the “They’re not drones” thread and explain that shit
 
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JLTD said:
Yup.

But what about overseas owner manuals for the same engine that specify heavier weight oils?

And CAFE vs engineer recommendations... you said you know some high level guys at corporate...what's their take?
(Not fighting...just seeking information & attempting intelligent discourse online LOL)

🤷
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What about the price of tea in china? Do you live overseas or have a vehicle from over there? If you think it’s better why not just run it then? If they use gear oil in their motors and you think it’s good, go for it.
 
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To be clear, I don't live overseas and couldn't care less what is stated in owners manuals over there. What I do know is that in places like Europe, they have the world's strictest emission and fuel economy standards. Don't believe me, look it up. If anyone was trying to do whatever they could to improve fuel economy, it'd be them and to the point where they'd cheat if they had to. Think, VW when they got busted for rigging their software back in 2015. That said, I find it incredibly hard to believe that Stellantis would risk a class action law suit here in the US due premature engine failures and all because they're wanting to get an extra mile or two out of a tank of gas. You know, because MOST of their customers will use their dealership to service their Jeeps or follow what is written in their owners manual. But hey, I'd be the first to say that I'm not an internet expert or an expert of any kind in anything and would never pretend otherwise.
 
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Joey1313 said:
I found a sticker from its last oil change. It was at a dealer so I assume it's what's in the manual.

I'll just stick to that I think.
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Honestly, if you were willing, the single BEST thing you could do is to always have your oil changed at the dealership. This not only creates a record of service, you will become a customer of theirs and IF anything were to ever go wrong on your Jeep, they will go to bat for you instead of just voiding your warranty and kicking you to the curb.
 
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Well, so much for intelligent discourse. But I'll answer your mostly off topic questions in the spirit of...something.

OverlanderJK said:
What about the price of tea in china?
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Who cares? Not me. Why do you ask?

OverlanderJK said:
Do you live overseas or have a vehicle from over there?
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No. And no, unless you count a Stellantis product as an overseas vehicle.

OverlanderJK said:
If you think it’s better why not just run it then?
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I do!

OverlanderJK said:
If they use gear oil in their motors and you think it’s good, go for it.
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Well now that's just crazy talk. This is about which motor oil grade to use, not which incorrect fluid to try out.
 
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wayoflife said:
To be clear, I don't live overseas and couldn't care less what is stated in owners manuals over there.
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Understood. Respectfully I believe you are missing my point. I'll reiterate that I said you can't go wrong following the OM. My point is that from a vehicle owner's point of view, you can safely use a different grade of oil. To spell it out, I provided the overseas reference for illustration. That's it. [insert warranty discussion here.]

wayoflife said:
What I do know is that in places like Europe, they have the world's strictest emission and fuel economy standards. Don't believe me, look it up.
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No need to look it up, we're in agreement here.

wayoflife said:
If anyone was trying to do whatever they could to improve fuel economy, it'd be them and to the point where they'd cheat if they had to. Think, VW when they got busted for rigging their software back in 2015.
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Point.

wayoflife said:
That said, I find it incredibly hard to believe that Stellantis would risk a class action law suit here in the US due premature engine failures and all because they're wanting to get an extra mile or two out of a tank of gas.
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This would be a better discussion over a mess of beers but I'll try to be brief.

The thing about CAFE is the penalties and rewards manufacturers get based on corporate fuel economy ratings, spread out over the # of vehicles sold annually. I've educated myself on it pretty thoroughly.

Add that to the fact that most US vehicle owners don't keep their vehicles for a long time any more (though average vehicle age in the US is rising), and it's easy to see why engine longevity is no longer a priority. It's been shown that higher viscosity oils, to a point, reduce engine wear.

In all fairness, motor oil chemistry HAS advanced greatly over the last 15 years or so, which mitigates some of the issues.


wayoflife said:
You know, because MOST of their customers will use their dealership to service their Jeeps or follow what is written in their owners manual. But hey, I'd be the first to say that I'm not an internet expert or an expert of any kind in anything and would never pretend otherwise.
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Me either. But we all know what we know and I'm not one to simply spout off info found online. Just attempting to discuss a concept but apparently it's falling on deaf ears.

Again Ed, not trying to tell anyone what to do, or not to follow the OM. Just saying it's safe to use thicker oil than specified, because the engineers aren't the only ones writing the OM any more.
 

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WJCO said:
At the end of the day, a 50k vehicle with a warranty, I'll do whatever the fuck they tell me in the owner's manual so if I have a claim, they can't split pubic hairs trying to deny my claim because I didn't follow the manufacturer's advice.
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So, true story here. My old 2012 Jeep JK Wrangler Rubicon Unlimited known as Rubicat had a bad head really early on. This is of course right after the 3.6L had come out and as I'd come to find, there were issues with casting sand that would jack things up. Fortunately, this was covered under warranty. Fast forward to 100k miles later, I had the same head go out and at the time, I was out of warranty. But, being that I had this fixed in the past AND I had been following proper oil changes and with what was stated in the owners manual, my dealership covered it again. I can only imagine what would they would have done had I been going off of internet expert advice.
 
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