Pennzoil has the MS Certifications from Stellantis, parent of FCA and is used in production engines. The MS certification numbers are in your owners manual and any oil meeting the listed requirements are good to use.

 

[QUOTEt="Jay2011JK, post: 35369612, member: 85861"]
Pennzoil has the MS Certifications from Stellantis, parent of FCA and is used in production engines. The MS certification numbers are in your owners manual and any oil meeting the listed requirements are good to use.
[/QUOTE]

I was under the impression that the oil companies are provided access to the specification and they did their own qualification testing, and proclaim whether they meet a particular car manufacturer spec, essentially "self-certify".

The only exception I was aware of was GM Dexos, which is a licensing agreement to use the copyrighted logo.

But to the OP's concern about using Pennzoil or any other brand, it's specfically stated in your manual that Jeep recommends using oil meeting MS-xxxx. Read the oil container specifications or the oil maker's website for these specifications which they meet for the specific oil.

If you are concerned about a particular dealership's maintenance, maybe a different one is worth exploring.

Also, registering your Jeep on the Jeep website will allow you to view maintenance records performed by a Jeep dealer, in addition to keeping the paper record you are provided by the dealer.

Pennzoil Platinum is good stuff and in the correct viscosity, it meets or exceeds the MS spec for your Jeep.

 

So my question still remains, is Jeep filling the crankcases from the factory with Pennzoil or Mopar oil? I obviously know to use the properly rated oil as stated in the owner's manual. Is my dealer correct that Penzoil is the only oil Jeep is using from the factory? My dealers parts department doesnt sell any oil other than Penzzoil.

 

Sorry, there are all levels of knowledge that come and go on these websites. Oil being a real hot button topic on almost any forum.

About the Mopar oil being made only by Pennzoil, or whether Jeep fills at the factory with Pennzoil, I don't know. But, a more likely source of that answer is the Bobistheoilguy forum.

 

Found this. Chrysler and Pennzoil® | Pennzoil

Your dealer was right.

 

Mopar is a brand name not a manufacturer. It's all under license from other companies.

 

What's interesting is that the dealer chooses to buy Pennzoil branded oil (presumably cheaper and from a source other than Stellantis).

 

Stellantis is not an oil producer. Mopar is a licensing name only.

 

I wouldn't believe anything stellantis has to say about squat, I'd have to have Sh$$ for brains.
Use the correct weight, pic your favorite brand

 

When having this conversation with my dealership (a good one), they explained to me that Pennzoil synthetic is used at the factory and that is what they use. The subject came up, because I specified using "synthetic", to which they replied that is all they use. Nothing else. They purchase it in bulk.

 

That Pennzoil webpage indicates they have at least a couple different quality levels of "synthetic." Is it platinum? Or is it platinum ultra?

 

Penzoil is correct.

 

I'm one of those who believe Oil is Oil, as long as you put the oil in that is recommend by the manufacture and meets their specs. I spent a week trying to figure out what oil to put in the 2004 TJ that I just purchased, it had a oil change sticker on the W/S that said, 5W 30, which is listed on the manufactures list of approved oils. Since I live in Texas and this vehicle will not be used in cold weather and is stored in temp controlled shop I decided to go with 10W 30 for the climate in my area, the other oil Jeep had on there list of oils to use. After reading about many oils, I decided to go with Mobil 1 oil and filter, reasons I couldn't find a thing bad about it and I can purchase it a Walmart a good price. I still feel any good brand will do the job as long as it meets factory specs.

 

I spent a week trying to figure out what oil to put in the 2004 TJ that I just purchased, it had a oil change sticker on the W/S that said, 5W 30, which is listed on the manufactures list of approved oils.

Regarding the 4.0L, I live in a moderate climate. I've never regretted using 20-50. That weight of oil tolerates and rapidly dissipates high heat under work load. Wheeling 105 degree Utah trails or Colorado thirteeners, my engines always ran cool. quiet and smooth. The 20w part of the spectrum was good down to 15 degrees Fahrenheit. Oil rapidly responds to engine heating after ignition. The 4.0 is a low RPM high torque, long stroke tractor engine. Mine did not like low viscosity lubricants when working hard. Shorter stroke, lower torque V6s and 4s do better with lighter oils.

 

Interesting marketing decision, that their 10W-60 was not Ultra, per Dogger's article. Intuitively I would have guessed the 10W-60 people are Ultra people.


Since I'm in TX I'm still hoping someone else will offer a 15W-30. The Chevron version was not called a synthetic. Not surprised that AMSOil has not offered 15W-30, since they're in the upper midwest.


It never drops below freezing along the Gulf coast, so I'm still thinking about AMSOil's 20W-40.

 

It never drops below freezing along the Gulf coast, so I'm still thinking about AMSOil's 20W-40.

Never?

I thought I'd read of both New Orleans and Houston experiencing freezing temperatures at some point at least once over the years.

 

Houston and New Orleans are just a bit inland, so it's theoretically possible for them to dip down to 31 once every five years. If I were in Houston or New Orleans I would feel safe with AMSOil's 20W-40. I'm a bit closer to the shore in Corpus Christi, so it won't freeze here.


Dallas offers the potential for cold weather once every five or ten years, so I'm still hoping AMSOil will offer their Signature product in 15W-30. Not holding my breath though, because they're in the upper midwest.

 

I never liked Pennzoil. A few mechanics have told me over the years it GUMS up your engine. I was once shown evidence by one of my mechanic friend whom had an engine tore down in his shop...

NOW, of course, everything is synthetic, so if I'm getting a FREE oil change at the dealership for some reason, I'll just change it out sooner.

I use CASTROL EDGE. If you're older (like me) you'll recall the commercials about it's inherently developed for "smaller, higher revving engines"... now it seems ALL engines are smaller, higher revving. So why not.
CASTROL SYNTHETIC meets Chrysler MS6395 standard.

I was recently researching which oil to use in my new(er) Lexus (fancy Toyota Highlander). Of course Toyota says use Toyota oil. Which for the most part is rebranded MOBIL 1 synthetic. MOBIL 1 also carries the MS6395 designation.

Considering the longevity of Toyota products, maybe there's something about MOBIL 1. I, however, never wait 10k miles to change oil. 3k - 4500k miles.

 

I never liked Pennzoil. A few mechanics have told me over the years it GUMS up your engine. I was once shown evidence by one of my mechanic friend whom had an engine tore down in his shop...

NOW, of course, everything is synthetic, so if I'm getting a FREE oil change at the dealership for some reason, I'll just change it out sooner.

I use CASTROL EDGE. If you're older (like me) you'll recall the commercials about it's inherently developed for "smaller, higher revving engines"... now it seems ALL engines are smaller, higher revving. So why not.
CASTROL SYNTHETIC meets Chrysler MS6395 standard.

I was recently researching which oil to use in my new(er) Lexus (fancy Toyota Highlander). Of course Toyota says use Toyota oil. Which for the most part is rebranded MOBIL 1 synthetic. MOBIL 1 also carries the MS6395 designation.

Considering the longevity of Toyota products, maybe there's something about MOBIL 1. I, however, never wait 10k miles to change oil. 3k - 4500k miles.

I think that was Quaker State that sluged up your engine they had a problem a while back and Penzoil has always been good

 

I have heard the same thing about Pennzoil, but that was years ago before all the "Synthetic" oils. Also Pennzoil makes their Platinum Oil from natural gas. Supposed to be much much cleaner.

 

My bias has been top grade Pennzoil for decades. I don't know what Mopar or Chrysler uses for jeeps but I do pay attention to the grades listed.

 

So could it be the case with the JL's recommended 0W-20 engine oil, as it arguably is with the ESS system as well, that a corporate decision was made largely or strictly with a view to (ever so slightly) boosting an enhanced EPA fuel economy rating, that is actually not in the best or long-term interests of the vehicle's engine, and the vehicle's owner?

In other words, can it possibly be factually argued that we may ideally want to use a heavier weight engine oil in our JL's than the recommended 0W-20? (Putting aside ramifications of violating the warranty by doing so.)

 

Definitely, a word for thought...........

 

As long as you use oil that meets the specs of the manufacturer, to quote “at this point what difference does it make”?

 

Well, after having your engine blow up, you might end up looking back and saying "some rings and pistons did some things".

 

The last thing I would worry about with a new Jeep/Stellantis vehicle, would be lubricant viscosity.

 

A friend of mine works for a company in Houston called Lubrizol that blends oil (detergents, anti wear additives, etc) for almost every manufacturer there is.
He told me that of all the oil companies they do work for only Castrol consistently sends people to check that the blends are being properly made and that most of even the biggest companies never send anyone.

 

Sorry about the quality of the PDF. This is an old article about manufacturers switching to the lower viscosity oils. Also an old letter from the EPA. I found one more old bulletin from Fordthat mentions improved fuel economy.

Whether it is Mopar, Ford, GM, I think it is all about CAFE.

 

Good read! It's like I figured it's all EPA type shit. They all say engine life is still good but that's the manufacturers. I still don't see how the thinner viscosities can be as effective at stopping metal on metal contact during high stress like flooring it.

 

Also a good read, about Nissan's study finding 10W-30 more protective than 5W-30 :

Do you think that's "thick" oil? Think again!

Recently there has been concerns regarding premature timing-chair wear, which resulted in people using thicker oils. Many people think that when they use a 0W-40, they are putting in a thick oil because it's "40-grade" when it's at normal operating temperature. It turns out that it's not that...

bobistheoilguy.com

 

That's what I'm thinking. With the oil being at ambient temperature and 0 weight how can it keep things floating instead of metal on metal friction under heavy load without letting the oil warm up? Even at idle in neutral there's a lot of pressure on connecting rod bearings.

 

I use 10w30 semi synthetic in everything from jeep lawnmower tractors for a long time get it in a 55 gallon drum never a problem

 

I have no doubt that using 0w20, 5w20 in an engine that recommends it will last for 100,000 miles and get better fuel economy than a heavier viscosity would. I am one of those that typically keeps a vehicle for a lot longer. I think what is not known is whether an engine under identical conditions would last longer using a heavier viscosity. 0w20 compared to 5w30 for example.

 

Not to worried about the operating temperature viscosity. I just hope it's enough. How is zero possible? It means nil. Think it might be an exaggeration? I'll bet if someone did an impartial torture test about start-up wear it would be higher for 0w20 than 5 or 10w20. But that would take forever because u'd have to let the oil cool between starts.

 

I have had my Wrangler 20 years running on 10w30 and still going strong

 

With all that in mind, Muffin Top, let me ask you directly: If the manufacturer recommended for your Jeep the use of a 0W-20 oil, would you (or do you) use a heavier viscosity oil instead?

 

I'm not MuffinTop, but if I may get into this, my answer is YES:
1) My Jeep calls for 5W-20 and I use 5W-30 Sign. Ser. AmsOil -- I would use 5W-40 if AmsOil made it but their product line instead jumps to 5W-50 which I think is a bit too much. (Allowing that my manual allows for 5W-30 if 5W-20 isn't available).
2) Likewise my wife's Subaru calls for 0W-20 and I use 0W-30 (also SignSer AmsOil).