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)

🤷
Click to expand...
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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