Thinner is better?

[Oilgal]

Oil pressure is a measurement of resistance to flow, and oil flow, between plane bearings and rings etc., is what lubricates and cools critical engine parts. That is what I got from reading Dr. Hass, .... and I just know he is right.


See you all later.

 

[JAG]

Here is how hydrodynamic bearing design can be done: http://www.utm.edu/departments/engin/lemaster/Machine Design/Lecture 26.pdf

This page contains the above link plus other links plus info on this page. http://www.roymech.co.uk/Useful_Tables/Tribology/Liquid_Lubrication.htm

 

[JAG]

Originally Posted By: Oilgal
Oil pressure is a measurement of resistance to flow, and oil flow, between plane bearings and rings etc., is what lubricates...

That's just terrible. This is mis-education that has fooled many people into believing it. Since I value proper lubrication education of us all, this has ticked me off for years...not at you Oilgal but at the surgeon.

 

[1sttruck]

Oil 'weight' vs oil 'protection' in most consumer vehicles should result in a 'J curve'. Rapid, catastrophic failure will only be seen at the extremes of the range of weights, and within a more reasonable range one will only see more or less wear over longer periods of time. This will be confounded by sustained loads, peak loads, ambient temperatures, and general use. A high level comparison of suitable oils would be to compare Europe or Australia vs the US on the same model of vehicle, where one tends to see lighter oils being used in the US. The lighter oils work just fine for driving in the US and are in part addressed by typically changing lighter, less expensive oils more often.

The ability to use lighter oils doesn't change the general principle of heavier oils providng better protection, which is evident by examples of F1 teams using a lighter oil for qualifying and racing in order to achieve maximum output, and switching to a heavier oil for everything else in order to minimize wear and make the engines last.

 

[FZ1]

"You can never be too rich or too thin."

 

[farrarfan1]

Originally Posted By: JAG
Originally Posted By: Oilgal
Oil pressure is a measurement of resistance to flow, and oil flow, between plane bearings and rings etc., is what lubricates...

That's just terrible. This is mis-education that has fooled many people into believing it. Since I value proper lubrication education of us all, this has ticked me off for years...not at you Oilgal but at the surgeon.

Trying to counter all the speculation, guesses,theories and mis-education that the "gurus" and "experts" fill these pages with every day is going to keep you very busy JAG. Good luck.

 

[virginoil]

Originally Posted By: farrarfan1
Originally Posted By: JAG

............., this has ticked me off for years...not at you Oilgal but at the surgeon.

Trying to counter all the speculation, guesses,theories and mis-education that the "gurus" and "experts" fill these pages with every day is going to keep you very busy JAG. Good luck.


I am compelled to add this comment. "Perfectly acceptable in a free world that entitles each and all of us to have and form an opinion and express that opinion, regardless of where we are on that BITOG learning curve. Freely on a forum where we are tolerant and respectful of each others views". And all the people said, “Amen”

 

[Oilgal]

JAG

I am going to very carefully study the information you linked to. Thank you so much for posting it. I truly do appreciate it more than you know.

I am keeping my mind open, as in, I know I haven't even met "jack" let alone gotten to "know jack". Does that make sense?

I had a quite a day. It got up to near 50* F today, and so I got busy. You guys should see my van now!

 

[farrarfan1]

Originally Posted By: virginoil

Originally Posted By: farrarfan1
Originally Posted By: JAG

............., this has ticked me off for years...not at you Oilgal but at the surgeon.

Trying to counter all the speculation, guesses,theories and mis-education that the "gurus" and "experts" fill these pages with every day is going to keep you very busy JAG. Good luck.


I am compelled to add this comment. "Perfectly acceptable in a free world that entitles each and all of us to have and form an opinion and express that opinion, regardless of where we are on that BITOG learning curve. Freely on a forum where we are tolerant and respectful of each others views". And all the people said, “Amen”


Expressing an opinion is not the same as saying things that are simply wrong, or giving bad advice without having any basis in fact to back it up.I think that's what JAG is trying to combat and I wish him luck in his endeavor.

 

[Oilgal]

"Math is hard." - Barbie

 

[JAG]

LOL. Oilgal, you're welcome. That second link above was posted in the Interesting Articles forum. If you haven't already, check out most of the threads there. It's loaded with high quality information. Tribology is as "hard" as any of the physical science subjects because it's a combination of many of them. If you want to read some papers that are not available online for free, PM me and I can email them to you.

Thanks for the support farrarfan1.

 

[farrarfan1]

I've seen your frustration in some of your other posts JAG.

 

[Gary Allan]

Originally Posted By: 1sttruck
Oil 'weight' vs oil 'protection' in most consumer vehicles should result in a 'J curve'. Rapid, catastrophic failure will only be seen at the extremes of the range of weights, and within a more reasonable range one will only see more or less wear over longer periods of time. This will be confounded by sustained loads, peak loads, ambient temperatures, and general use. A high level comparison of suitable oils would be to compare Europe or Australia vs the US on the same model of vehicle, where one tends to see lighter oils being used in the US. The lighter oils work just fine for driving in the US and are in part addressed by typically changing lighter, less expensive oils more often.




Your qualifications work if you're doing failure analysis. It doesn't mean that you will ever approach those margins in most sensible or even marginal use ..at least to any statistically significant level.

 

[Steve S]

From my years of experience ,with out having to try to out engineer the engineers just use the recommended viscosity for the temperatures encountered .It works. The bearing widths and clearances are what you get and not much can be done about it. Engines are fairly tolerant of the abuse that they withstand.

 

[Gary Allan]

5w-20 spec'd from Canada to Texas. Both live long lives. How can it be?

 

[Steve S]

Originally Posted By: Gary Allan
5w-20 spec'd from Canada to Texas. Both live long lives. How can it be?
The recommended viscosity.

 

[double vanos]

I think Bill in Utah has it nailed in his signature - Use the BEST oil for your car - follow your manual for TYPE and OCI.

Just look at his UOA's.....the prosecution rests.

Cheers all!!

 

[98LSC32V]

Originally Posted By: double vanos
I think Bill in Utah has it nailed in his signature - Use the BEST oil for your car - follow your manual for TYPE and OCI.

Just look at his UOA's.....the prosecution rests.

Cheers all!!


My manual says use 5w30 but the engine is back speced for 5w-20 so i'm using 0w-20, should I switch back?

 

[Steve S]

Originally Posted By: 98LSC32V
Originally Posted By: double vanos
I think Bill in Utah has it nailed in his signature - Use the BEST oil for your car - follow your manual for TYPE and OCI.

Just look at his UOA's.....the prosecution rests.

Cheers all!!


My manual says use 5w30 but the engine is back speced for 5w-20 so i'm using 0w-20, should I switch back?
There we go ,,it is your car and you can use what ever oil you want.

 

[TMR]

I have an '08 Accord 4cyl and plan on using a synthetic 5W-20 all year except for one OCI cycle that cover the coldest part of the winter...when I plan on using 0W-20.

I live in Northern Minnesota and some of the coldest days can get to low of -30F with high of -10F...not too often but I see no downside to using 0W-20 for one...say three month period? Coldest days this winter I did not like the engine noise after all day/outside in -15F...that was on factory fill 5W-20 dino. Probably would be better even with the 5W-20 synthetic?

BTW...I don't think this is "necessary"...just seems like a good idea...

Thanks...Tom R