Viscosity Breakdown in Oils

[swampflyer]

For a 30 grade, I would suggest the M1 ESP 0w30 rather than a random 5w30. It is near the upper end of the bracket for 30 grade viscosity. You can get it at Walmart and O'Reilleys or was it Autozone?

on my next oil change I will go to 0W30. I've been using amsoil lubricants in the engine and diff since new. I'm sure they have a 0W30 . Thanks, by the way first thing to go is the memory and the second thing you don't remember. lol

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[CarbonSteel]

So, what viscosity would you recommend for someone who is not worried about fuel mileage, but wants their engine to last longer?

Mobil 1 ESP 0W-30. It has a cSt of 12.0 at 100°C against a cSt range of 9.3 to 12.5 for xW-30 oils, which makes it a very "thick" xW-30 oil.

It holds viscosity through the full oil change of 5K miles. It worked well in my 3.6L and my 2.7L in my Bronco which has significant fuel dilution and destroyed Motorcraft 5W-30 in about 1K miles turning it into a thin xW-20 viscosity.

 

[Pape]

That means, that it has more resistance to flow, than 0w20. As the viscosity numbers increase, so does the resistance for the oil to flow. Therefore, 30 viscosity is thicker than 20 viscosity.

Not really, you know that in some condition 20 have more resistance to flow than 30 ?
Unless you engine always stay at the same temperature oil flow resistance will vary, even in the acceptable operating temperature 30 can offer less resistance than 20.

Let me insert this: application dictate Chemistry.

 

[Pape]

I didn't mean to confuse you. I'm using thicker oil. I know this much; 0w20 isn't preventing rocker/cam failures from happening. YMMV. I like overkill too.

Are you running UOA on our oil ?

 

[Jeep Wick]

As you can see I live in the free state of Florida and it gets hot here. What do you think of maybe 5w30 instead of 0w20. You really didn’t confuse me what I was trying to say was it’s just a dilemma to try and figure out what is better for your engine. I’m always open for educated common sense remedies for the jeepin community and your experience is noteworthy.

I'm not far from you, I run 10w30. The engine likes it. It might cost a little mpg but worth the peace of mind for me.

 

[Oletimer]

Since he told you....checks watch.... Nine years ago...

You'd think there would be a lot more 5.7 failures or parts specific to the 5.7 failing since they're apparently only designed to last 5 years/ 125k.

If your friend is the Ma Teresa of engineering that you say he is, where's the proof in the pudding? We should have plenty of evidence by now.

I think some of us are left wondering what level this guy was at, too. Those kinds of statements can carry serious liability for a company, so someone in "the know" with these things isn't likely to tell someone about intentional failure design to someone else who repeats those lines in a public forum. Not if they're paid well and/or aren't willing to risk personal exposure.... I'm thinking this is a pile of horsefeathers.

Maybe horsefeathers, I can't prove a thing, however my last 2 5.7s laid down on me .
Cam failure at less than 100,000.
I believed it enough to buy a 5.0 f150.
And couldn't help myself, a 392.
The last ram that I own is a 23 and I'm running M1 5w40 European in it. 65 ,000 and no ticking yet.

 

[Oletimer]

Your friend was messing with you. I'm an engineer, we don't "design things to fail" at a certain point. Everything is designed with a life span in mind...but that doesn't mean it's "designed to fail". It's spec'd to ensure that it lasts a given amount of time. For me, it's MTBF, but it's the same concept.

All of this argument is silly - changing your oil viscosity by 5-20 points is not going to make a material difference in the longevity of your motor. Period. I've said this countless times - just use what helps you sleep at night, but don't fool yourself into thinking you're fixing anything or preventing anything.

I will take the we agree to disagree deal.
Maybe he did lie. Guess I will never know.
But I put 40 million miles on perterbuilt road trucks over 40 years, not as driver obviously but as owner.
I have some strong beliefs about viscosity.
Good day

 

[swampflyer]

I'm not far from you, I run 10w30. The engine likes it. It might cost a little mpg but worth the peace of mind for me.

Glad it works for you. If this 3.6 tanks I’m putting a hemi in it and calling it be done with it.

 

[roaniecowpony]

on my next oil change I will go to 0W30. I've been using amsoil lubricants in the engine and diff since new. I'm sure they have a 0W30 . Thanks, by the way first thing to go is the memory and the second thing you don't remember. lol

Yeah im a preferred customer with Amsoil but I believe the M1 ESP is at least the equal to signature.

 

[Oletimer]

Yeah im a preferred customer with Amsoil but I believe the M1 ESP is at least the equal to signature.

Is that better for a 392 than European?

 

[swampflyer]

Yeah im a preferred customer with Amsoil but I believe the M1 ESP is at least the equal to signature.

I agree.

 

[Willys41]

so what’s the best oil we should be using in our amazing 3.6 ?

After seeing that the Maserati 3.0 gas engine uses European 5w40 and is basically the same engine as the 3.6 I switched to 5w40 from 5w30. I just wish I would have done it sooner.

 

[Willys41]

You're talking about the same company that says the transmission fluid is a "lifetime fluid" right?

Ya right life time oil. I put 370K on my Tundra and changed the trans fluid every 20 to 30k and stiil had the original trans when I sold it.
I put trans drain plugs in both my Wrangler and will be doing the same.

 

[roaniecowpony]

Is that better for a 392 than European?

I really wouldn't know, unless I ran oil analysis on the engine using the spec oil then moved on to the different oil and ran the oil analysis.

 

[Oletimer]

O

I really wouldn't know, unless I ran oil analysis on the engine using the spec oil then moved on to the different oil and ran the oil analysis.

Ok, thanks for the honest answer.

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