Amsoil is only way to go. I wouldn't put Mobil 1 in my enimies car.

 

Might help some choosing a oil... MOTOR OIL ENGINEERING TEST DATA

 

I have read much of 540 Rat's blog. He provides a lot of useful information. My only issue is that while claiming to be a mechanical engineer with SAE and ASME affiliations, he remains anonymous and provides limited transparency regarding the methodology and equipment used for motor oil wear testing. This lack of identifiable credentials and detailed procedural disclosure raises concerns about the credibility and reproducibility of the results, despite his claims of unbiased and factual data.

 

I just sent out 2 Blackstone samples for our 2007 Grand 5.7 and our 2017 Wrangler 3.6 both with about 133,000 miles on them. I’ll report back on wear & how well the oil stayed in grade. To me this is one of the few ways to be objective in these debates. Anything else just seems like conjecture….

 

I stick to what motors call for. In 65 years of driving and changing oil, I never had 1 problem and never had a engine fail. I grew up around garages and mechanics, all tell you to change your oil often. Like I said I haven never even had a motor burn oil anytime. Abner

 

I stick to what motors call for. In 65 years of driving and changing oil, I never had 1 problem and never had a engine fail.

Nothing wrong with that approach.

 

If you watch the Motor Oil Geek he details lots of testing of all kinds of oil. Some of the stuff that was true 10 years ago is no longer true due to changes in oil formulation. Zinc levels, using Diesel oil in gas engines, dino v synthetic and a long list of stuff.

 

Bob is the oil guy is another good resource. There is a whole section of virgin oil test results to use as a research guide if one were so inclined.
As I said early in this thread, the additive package is the important part of the equation, don't get hung up on viscosity.
A small deviation one way or the other is inconsequential.

 

Ok so here’s my first report of using the specified oil (5/20) of our 17 Wrangler 3.6 V6 at 133,000 miles and changed every 7,000 miles:
all wear metals very low, oil stayed in grade, and there was no contamination as far as antifreeze or fuel. So for this particular engine in our use, no reason to not use the specified oil….

 

Ok so here’s my first report of using the specified oil (5/20) of our 17 Wrangler 3.6 V6 at 133,000 miles and changed every 7,000 miles:
all wear metals very low, oil stayed in grade, and there was no contamination as far as antifreeze or fuel. So for this particular engine in our use, no reason to not use the specified oil….

5W20 at 7000 mile intervals beats 0W20 at 10,000 mile intervals. But in the end, you're probably just one of the lucky ones.

 

FWIW, it’s been about 4 weeks and 800 miles since my last oil change at 182,000 miles. Top and rebuild was done at about 140,000 miles. Engine has always clattered on start up, sometimes at idle. Since 6.5 qts 10w30 and .5 qts Marvel Mystery Oil startups have been quiet, idle has been quiet, ECO mode seems to function same as it ever did.

I wish I’d done this when I bought it at 133,000 miles.
I have a bunch of 5w20 in the garage that I guess I’ll use up in conjunction with some Lucas Stabilizer or STP to thicken it up.
Bottom line, see bumper sticker.

 

My 2015 JGC Ltd. with the 3.6L Pentastar calls for 5w-20, but that engine was originally designed for 5w-30, and that's what I've been running for the last 20k miles with no problems. Jeep switched the Pentastars to 5w-20 in 2013 purely to improve fuel economy without making engineering changes, so 5w-30 works fine.

Your 2019 model is a different story. In 2016, the Pentastar underwent significant engineering changes. Among other things, they increased the compression ratios, introduced two-stage variable valve lift, torque-activated cam phasers, low-tension piston rings, carbon-coated wrist pins, new low-friction valve springs, and revised timing-guide materials, etc. This is also when Jeep started requiring 0w-20 oil.

I wouldn't use anything but 0w-20 oil in a post-2016 Pentastar. The 2016 updates necessitate 0W-20 because the new VVT and friction features were designed with this viscosity in mind to minimize drag and ensure lubrication in the updated valvetrain. Do you really want to mess with that?

Rather than switch viscosity, I might upgrade the oil brand. I'm personally planning to use Valvoline Restore & Protect for my next three oil changes based on the favorable reviews that product has for eliminating sludge and varnish, even down into the piston rings. With a 2019 engine, I bet that sort of cleaning would make a difference.

 

It just smells worse...

 

Gear Oil vs. Engine Oil: Viscosity Comparison
Gear oil differs from engine oil. While many motorists may assume SAE 90 gear oil is thicker than SAE 40 or 50 engine oil, their viscosities are the same, as this gear oil viscosity chart shows.

Gear Oil vs. Engine Oil: What's The Difference? - AMSOIL Blog

When looking at gear oil vs engine oil, their viscosity ratings and additives are two primary things to keep in mind.

blog.amsoil.com

 

Terrific, but completely irrelevant to what I said. I'm not talking about 90 weight gear oil compared to 50 weight engine oil.

Now if you want to compare different viscosity gear oils to our specified engine oil, then you'll be much more relevant. Let me know how that comparison works out. Hint: gear oil is thicker. Let's use the gear oil I mentioned for clarity.