Accidentally used 5W-20

[JLfromCA]

I have never found any--it appears that globally FCA recommended 0W-20. With that said, the other part that is false is the statement that a 3.6L is "viscosity sensitive". It is not. I ran xW-30 in mine for more than 50K miles and I have a friend who is bumping 140K in his and ran 0W-40 from the first oil change. ZERO issues.

Run whatever you want from xW-20 to xW-40, there is no impact to VVT, but higher viscosity oils provide more protection versus lower viscosity.

Correct, there’s many many threads on this where people claim other countries, but nobody has ever shown proof.

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[CarbonSteel]

Correct, there’s many many threads on this where people claim other countries, but nobody has ever shown proof.

Usually, it is true that other countries who do not have to comply with CAFE recommend a higher viscosity oil, so it is easy to assume that it applies to the 3.6L PUG. I found a few Wrangler owner's manuals online for parts of the Middle East and Australia, which almost always have a higher viscosity oil, but not in this case.

 

[hilljumper]

Own a 2022 Jeep Wrangler JLU Sport. Went to go buy 5W-30 oil today and the container felt a little light on so I grabbed the one behind it….after putting it in, I realized it said 5W-20. Am I screwed?

Edit: 3.6L engine. Live in New Jersey

I think you may have permanently damaged the engine. If I were you I would sell it CHEAP AS IS before there is a problem. My number is 415 332 4314.

 

[JLfromCA]

Usually, it is true that other countries who do not have to comply with CAFE recommend a higher viscosity oil, so it is easy to assume that it applies to the 3.6L PUG. I found a few Wrangler owner's manuals online for parts of the Middle East and Australia, which almost always have a higher viscosity oil, but not in this case.

Agree, if they usually do it with other motors, and they specifically do not do it with this motor that leads me to believe that they actually engineered this engine, and it works as designed on the recommended oil.

 

[alphawolff]

Agree, if they usually do it with other motors, and they specifically do not do it with this motor that leads me to believe that they actually engineered this engine, and it works as designed on the recommended oil.

The difference is the engine was designed here stateside, so they base the worldwide specifications on our emission standards. Foreign manufacturers will base things off their own country, then realize they have to lower the viscosity to make it work here. Jeep doesn't go out of its way to do more testing than the bare minimum. It needs to survive its warranty period while not failing en-masse. If it checks those two boxes they ship it. They keep their engineering jobs regardless. Notice we don't get the 5 year/100k mile powertrain warranty anymore?

Another good example is the camshaft lifters fail significantly less in 6.2L and 6.4L hemis compared to the 5.7L. Guess what the difference is?

Interesting that the powertrain warranty went from 100k to 60k a few years after the 3.6 came out! This is comparing a 2017 and a 2014. The oil was changed late 2013 I believe.

 

[CarbonSteel]

Agree, if they usually do it with other motors, and they specifically do not do it with this motor that leads me to believe that they actually engineered this engine, and it works as designed on the recommended oil.

I am not in agreement with that given the rocker failures and the like, but your point is well stated.

 

[JLfromCA]

The difference is the engine was designed here stateside, so they base the worldwide specifications on our emission standards. Foreign manufacturers will base things off their own country, then realize they have to lower the viscosity to make it work here. Jeep doesn't go out of its way to do more testing than the bare minimum. It needs to survive its warranty period while not failing en-masse. If it checks those two boxes they ship it. They keep their engineering jobs regardless. Notice we don't get the 5 year/100k mile powertrain warranty anymore?

Another good example is the camshaft lifters fail significantly less in 6.2L and 6.4L hemis compared to the 5.7L. Guess what the difference is?

Interesting that the powertrain warranty went from 100k to 60k a few years after the 3.6 came out! This is comparing a 2017 and a 2014. The oil was changed late 2013 I believe.

I was under the impression that Daimler Mercedes had a lot to do with that motor. Although it was produced stateside, I believe it was developed in Germany.

“Under most FCA hoods is the Pentastar 3.6-liter V6 engine. Its development began in 2004, near the midpoint of the DaimlerChrysler era, and continued through both the divorce and the fire sale that followed with Chrysler's ill-suited, improvident interim owner, Cerberus Capital Management.”

https://www.autoweek.com/news/a1697191/ghosts-daimlerchrysler-heres-whats-leftover-forgotten-era/

 

[alphawolff]

I was under the impression that Daimler Mercedes had a lot to do with that motor. Although it was produced stateside, I believe it was developed in Germany.

“Under most FCA hoods is the Pentastar 3.6-liter V6 engine. Its development began in 2004, near the midpoint of the DaimlerChrysler era, and continued through both the divorce and the fire sale that followed with Chrysler's ill-suited, improvident interim owner, Cerberus Capital Management.”

https://www.autoweek.com/news/a1697191/ghosts-daimlerchrysler-heres-whats-leftover-forgotten-era/

Actually just learned about the engineer's PoV from this link:

https://bobistheoilguy.com/forums/threads/626-000-mile-pentastar-teardown.329423/#post-5474475

Essentially the engineers were incredibly nervous about dropping the oil viscosity even further to 0w-20, especially with stop start becoming a thing. They had to install some super expensive bearing coating to make it even workable. The thin oil was primarily for fuel economy above all else. Some really good information in this thread on the engine from a design standpoint; worth a read for sure.

 

[aeonixx1001]

Own a 2022 Jeep Wrangler JLU Sport. Went to go buy 5W-30 oil today and the container felt a little light on so I grabbed the one behind it….after putting it in, I realized it said 5W-20. Am I screwed?

Edit: 3.6L engine. Live in New Jersey

You put only 1 quart in? Being as anal as I am I would change my oil. But 1 quart is not going to do much. 20% of 5-20 in 80% 5-30. I really wouldnt be too worried from an engineering perspective. BUT, I couldn't stand it I would change it.

 

[Willys41]

Actually just learned about the engineer's PoV from this link:

https://bobistheoilguy.com/forums/threads/626-000-mile-pentastar-teardown.329423/#post-5474475

Essentially the engineers were incredibly nervous about dropping the oil viscosity even further to 0w-20, especially with stop start becoming a thing. They had to install some super expensive bearing coating to make it even workable. The thin oil was primarily for fuel economy above all else. Some really good information in this thread on the engine from a design standpoint; worth a read for sure.

This is what I have been saying all along
Get rid of the stop start and up viscosity
I assumed that Maserati 3.0 v6 runs 5W40 for a reason. NO MPG mandate

Unfortunately I left the company as the Gen II was kicking off. I do know the engineering team was VERY nervous on the 0w-20 stuff and it was 100% for fuel economy. My personal opinion knowing the bearing surface area would not have gone up because of the cost I would go up a notch in weight. Not a lot of downside for the margin. Also, we are designing for 150-200K max, not 200k+ so that is always something to think about when OEM's make recommendations.

I would like to note there was this bearing coating they started using called iROX which was very impressive at the microscopic and testing level. It had to go on the front and back bearings to pass Stop-Start because of wear and was very expensive. They likely added that to the rest of bearings to make them work but I don't know for sure, I will have to ask. Regardless, the bearing surface area did not likely increase so from a basic physics point of view your hydrodynamic response to "filling it with water" as we called it will not go in a safer direction at lower rpm.

 

[Rick4570]

Mu 22 JL with the 3.6 takes 5.5 quarts. 5 Quarts has it at the bottom of the dipstick. Of course I let mine drain for several hours before refilling.

 

[Rhinebeck01]

Mu 22 JL with the 3.6 takes 5.5 quarts. 5 Quarts has it at the bottom of the dipstick. Of course I let mine drain for several hours before refilling.

Proper fill is 5 qts.. Not that putting in an additional, unneeded .5 of a qt. matters, but.. again, proper fill is 5 qts..

From FCA press release when they first introduced the 2nd Gen Pentastar...
"Windage-tray weight was slashed by 19 percent and front-cover weight was cut by 5 percent. *The oil pan was redesigned from a two-piece to a single-piece pan and the sump was reduced from a 6-quart fill to a 5-quart fill *– resulting in an overall 5-pound weight savings compared with the previous generation Pentastar V-6 engine."

 

[Rick4570]

Proper fill is 5 qts.. Not that putting in an additional, unneeded .5 of a qt. matters, but.. again, proper fill is 5 qts..

From FCA press release when they first introduced the 2nd Gen Pentastar...
"Windage-tray weight was slashed by 19 percent and front-cover weight was cut by 5 percent. *The oil pan was redesigned from a two-piece to a single-piece pan and the sump was reduced from a 6-quart fill to a 5-quart fill *– resulting in an overall 5-pound weight savings compared with the previous generation Pentastar V-6 engine."

How does that work when it doesn't show on the dipstick with 5 quarts. Especially if you check it according to the owners manual (warm engine, let sit 5 minutes, check oil). In that case it doesn't show on the dipstick at all. Let it sit overnight, one side shows about 1/4 up the crosshatch, the other side shows barely on the end up the dipstick.

I called the dealer and talked to a tech, he said that when they change the oil, they don't let it drain like I do, so when they put 5 quarts in it usually shows filled. However, he said that he has talked to a lot of folks who change their own oil, and if you let it really drain it good, it takes 5.5 to put it at the top of the crosshatched area.

I have read several post on this very forum that says 5.4 to 5.5 if you drain overnight.

 

[Rhinebeck01]

How does that work when it doesn't show on the dipstick with 5 quarts. Especially if you check it according to the owners manual (warm engine, let sit 5 minutes, check oil). In that case it doesn't show on the dipstick at all. Let it sit overnight, one side shows about 1/4 up the crosshatch, the other side shows barely on the end up the dipstick.

I called the dealer and talked to a tech, he said that when they change the oil, they don't let it drain like I do, so when they put 5 quarts in it usually shows filled. However, he said that he has talked to a lot of folks who change their own oil, and if you let it really drain it good, it takes 5.5 to put it at the top of the crosshatched area.

I have read several post on this very forum that says 5.4 to 5.5 if you drain overnight.

@Rick4570

Proper fill is 5 qts. regardless of what you or I, or any tech says... what anybody says..

In regard to your oil changes....... Suggest you drain your oil ..... give an adequate amount of time for oil to fully drain out. Now, put the drain plug back in and then pour in exactly 5 qts. of oil. Place the fill cap back on and be done with it... don't even bother checking the dipstick. 5 quarts in there is 5 quarts... end of story..

Next oil change day ....What you might do is after you drain your oil and pour in the 5 qts., is to wait an hour and then insert the cleaned dipstick in and then pull it out. Now, with a tool, etch a mark on the dipstick right at the point where oil is on the dipstick.

Now, in the future, you can when the vehicle has sat for a few hours with engine not running, is cold, check the dipstick and now have a good read in regard to oil ...

.

 

[Rick4570]

(32) My 3.6 Etorque takes more than 5Q | Jeep Wrangler Forums (JL / JLU) -- Rubicon, 4xe, 392, Sahara, Sport - JLwranglerforums.com

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