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#4674685 - 02/22/18 05:40 PM brand x oil is thinner than brand y oil question
OilUzer Offline


Registered: 07/31/17
Posts: 136
Loc: WA
some background info:
just for kicks i did a test with conventional (dino) oil 5W-30 and 10W-30
put some of each in 2 clear plastic cups and tested both at room/garage temperature (60F) and the refrigerator (38F) and the freezer -2F
the 5W-30 looked thinner in all cases. obviously, the difference was more subtle at room temp vs. the freezer.
i also got my wife involved and she confirmed the results smile

another background info:
In "7.5Wx30 Oil" thread i asked about 50/50 mix of 5W-30 and 10W-30 producing 7.5W ...
kschachn, OVERKILL and others commented and correct me if i am wrong but the conclusion was that:

1-
There is no spec/designation for 6,7,7.5,8W etc. only 0W, 5W, 10W ... at least for auto oil.
sounds like there is 7.5W (another thread) for motorcycles but for thatís beside the point here.
2-
For all practical purposes, it is not practical/feasible/useful to have any classification in between 0,5,10W ...

as a result, 50/50 Mix will no longer meet the 5W spec and most likely be considered a 10W ...
Not wanting to split hair ... i can totally understand the above logic.


another thing leading to my question:
Based on the above logic, let's say that:
company A has an oil that barely misses the 0W spec and gets the Winter classification of 5W
company B (or even company A) has an oil that narrowly makes the 5W spec and is classified as 5W
correct me if i am wrong here but Oil A and B can practically (mathematically?) be 5W (4.9W) apart and both be classified as 5W

now my main question:
when people say brand x 5W-30 is "thinner" than brand y 5W-30 ... is it because of the reason above (oil A vs. B)
or am i over-simplifying things?

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#4674695 - 02/22/18 05:50 PM Re: brand x oil is thinner than brand y oil question [Re: OilUzer]
tig1 Offline


Registered: 01/03/09
Posts: 13661
Loc: Illinois
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_________________________
2007 Ford Fusion 227,000 miles
M1 0-20 EP
2017 Ford Fusion 49K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#4674707 - 02/22/18 06:04 PM Re: brand x oil is thinner than brand y oil question [Re: OilUzer]
bmwtechguy Offline


Registered: 06/15/04
Posts: 2673
Loc: South Carolina
There are definite ASTM tests that determine which XW-XX viscosity an oil meets. Of course there is a range of numbers at the testing temperatures at each viscosity that would allow one oil to be "thicker or thinner" than other oils at low temps, high temps, and anywhere in between. A graph could be plotted showing a complete viscosity curve if measurements were made for all temperatures in between.

For example, generally a full synthetic high mileage oil can be more viscous at all temps than their non-HM counterparts, yet still have the same viscosity label, such as 5W-30. I believe they are formulated this way to maximize fuel economy for the newer cars (meeting all the current oil specs when a car is new for warranty, etc) but later as the engine begins to consume oil, the HM formulations bump up the viscosity some as one way to slow the consumption and leaks, yet still remain within the 5W-30 specs.

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#4674789 - 02/22/18 07:57 PM Re: brand x oil is thinner than brand y oil question [Re: OilUzer]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1345
Loc: toronto
Originally Posted By: OilUzer

when people say brand x 5W-30 is "thinner" than brand y 5W-30 ... is it because of the reason above (oil A vs. B)
or am i over-simplifying things?


Usually in discussion on this site, people like to refer to the HTHSV when distinguishing one oil of the same grade as 'thicker' or 'thinner' than the other oil of the same grade. I don't recall a discussion in reference to the CCS and MRV when discussing 5W and higher varieties; usually those discussing cold viscosity just leave it at "0W grade", and then get into CCS and MRV values of various 0W graded oils to compare cold viscosity.

WRT to splitting W grades, I'm sure it's already been mentioned numerous times that we're talking about a 5 degree Celsius temperature difference in qualification between them, so what insights do you feel can be more readily conveyed in doing so?

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#4674836 - 02/22/18 08:52 PM Re: brand x oil is thinner than brand y oil question [Re: OilUzer]
BrocLuno Offline


Registered: 09/06/15
Posts: 5514
Loc: Kalifornia Kollective
When I say that one oil is thinner than another, I am referring to the op temp viscosity. I don't really care about what it's like sitting in the driveway (that's what happens when you live in Cali). So I have heavy 30's and light 40's and such in mind. That's where the wear curves are and fuel consumption, etc. At op temp ...
_________________________
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4674915 - 02/22/18 10:23 PM Re: brand x oil is thinner than brand y oil question [Re: OilUzer]
OilUzer Offline


Registered: 07/31/17
Posts: 136
Loc: WA
if we are talk about "relatively" a thin or thick oil, does it really matter what temp we are sampling it at?

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#4674921 - 02/22/18 10:32 PM Re: brand x oil is thinner than brand y oil question [Re: OilUzer]
eyeofthetiger Offline


Registered: 11/18/17
Posts: 683
Loc: South Carolina
Actually, brand y oil is thinner than brand x oil.
_________________________
2017 Ford Fiesta 1.0T - Valvoline SynPower 5W-20, Motorcraft FL910S
1988 GMC K1500 4.3/700R4 - Supertech 15W-40, Fram TG3980
1986 Ford Ranger 2.0 - uhh

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#4675036 - 02/23/18 03:45 AM Re: brand x oil is thinner than brand y oil question [Re: OilUzer]
Shannow Online   content


Registered: 12/12/02
Posts: 39858
Loc: 'Stralia
Originally Posted By: OilUzer
but Oil A and B can practically (mathematically?) be 5W (4.9W) apart and both be classified as 5W


As has been explained ad nauseum in the various recent threads, they are grades, which are band, and performing "mathematical" equations on them is not possible.

e.g


What mathematical process would you use to describe the things that are in the fringe region of Xrays and UV light, or visible light and Infra Red ?

ysult.5 ??
bleinf.5 ??

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#4675058 - 02/23/18 05:16 AM Re: brand x oil is thinner than brand y oil question [Re: Shannow]
OilUzer Offline


Registered: 07/31/17
Posts: 136
Loc: WA
Originally Posted By: Shannow
Originally Posted By: OilUzer
but Oil A and B can practically (mathematically?) be 5W (4.9W) apart and both be classified as 5W


As has been explained ad nauseum in the various recent threads, they are grades, which are band, and performing "mathematical" equations on them is not possible.

e.g


What mathematical process would you use to describe the things that are in the fringe region of Xrays and UV light, or visible light and Infra Red ?

ysult.5 ??
bleinf.5 ??


Thanks for the example, however let's make a simpler analogy. as someone explained in another thread with the grading system:
- student 1 scores 100 on a test and gets an A
- student 2 scores 90 on the same test and gets an A
- student 3 scores 89 on the same test and gets a B
one can argue that:
student #2 soft/thin A is not far from student #3 strong B and for all practical purposes they are almost the same!

To further clarify my question, is it possible that:
- oil A has a true 2.51W which is closer to 5W than 0W so it gets a classification 5W.
- oil B has a true 7.49W which is closer to 5W than 10W and get the same classification of 5W.
oil A and B are 4.98W apart but they are both classified as 5W.
based on that, can you conclude that oil A is a "thinner" 5W than oil B?

I also know that xW classifications jump from 0W to 5W and 10W, etc. and are not infinite and I understand why (it is not practical) but in real world, how can you force the oil/molecules to follow the 0, 5, 10W standard? hence 2.51W or 7.49W in my example.

This was basically my question. Not sure if it works this way and as I mentioned, maybe I am over simplifying or misunderstanding things.
again, I was not trying to reach a conclusion in my original post, it was a question which I thought may? explain the "thinner" oil theory!

Thank you!

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#4675076 - 02/23/18 06:13 AM Re: brand x oil is thinner than brand y oil question [Re: OilUzer]
Shannow Online   content


Registered: 12/12/02
Posts: 39858
Loc: 'Stralia
Best double troll act in the history of BITOG...congratulations.

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#4675096 - 02/23/18 06:54 AM Re: brand x oil is thinner than brand y oil question [Re: Shannow]
OilUzer Offline


Registered: 07/31/17
Posts: 136
Loc: WA
Originally Posted By: Shannow
Best double troll act in the history of BITOG...congratulations.


not sure where this is coming from!!!!
if you feel or think that you are being "trolled", please ignore this discussion.
you don't have to participate!

btw, if it matters to you, it is much easier for me to make an example with the grade system than the visible light spectrum.
someone else just used the grade system in another one of my threads and it was fresh in my mind ...
didn't mean to offend you or criticize your example!

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#4675113 - 02/23/18 07:19 AM Re: brand x oil is thinner than brand y oil question [Re: OilUzer]
OilUzer Offline


Registered: 07/31/17
Posts: 136
Loc: WA
and one more thing, I had to lookup "double troll" ... lol
first time I have ever been accused of any trolling let alone "double trolling" smile

I am not an internet guy. I am on VERY few websites (sports & car & recently this oil site) and hardly ever post anything! it goes thru cycles you know ... I am sure my "oil" related interest will die off sooner or later.
since i bought a car that requires 0W-20 i joined this site and got interested in oil ... every time i did a search for 0W20 it took me to BITOG!!!
also this site has tons of other information and I like it! it has become my "go to" web site for anything car related and more.

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#4675840 - 02/23/18 07:41 PM Re: brand x oil is thinner than brand y oil question [Re: OilUzer]
Garak Offline


Registered: 12/05/09
Posts: 24574
Loc: Regina, Saskatchewan, Canada
Originally Posted By: OilUzer
I also know that xW classifications jump from 0W to 5W and 10W, etc. and are not infinite and I understand why (it is not practical) but in real world, how can you force the oil/molecules to follow the 0, 5, 10W standard? hence 2.51W or 7.49W in my example.

The real answer, or best answer, at least, is that the viscometric properties of a given oil will fall somewhere on SAE J300. Where they fall dictates how the oil is labelled. Certain things are also likely to go hand in hand. A 10w-30 ILSAC, for instance, will exceed the 10w-XX limits fairly handily (but will not meet the 5w-XX limits) and will have a lower HTHS, just above the minimums for the grade. A 10w-30 HDEO will exceed the 10-XX limits much more closely and have an HTHS of 3.5 or higher. So, the 10w-30 ILSAC would already be what you consider a 7.5w-30. Except, however, it's not, because if it's a 10-XX but not a 5w-XX, it has to be labelled as a 10w-XX, and if it's meeting 5w-XX requirements, it has to be labelled as 5w-XX.
_________________________
Plain, simple Garak.

2008 Infiniti G37 - Shell ROTELLA T6 Multi-Vehicle 5w-30, NAPA Gold 7356
1984 F-150 4.9L - Quaker State GB 10w-30, Wix 51515

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#4675848 - 02/23/18 07:49 PM Re: brand x oil is thinner than brand y oil question [Re: OilUzer]
PeterPolyol Offline


Registered: 03/06/16
Posts: 1345
Loc: toronto
Originally Posted By: OilUzer


Thanks for the example, however let's make a simpler analogy. as someone explained in another thread with the grading system:
- student 1 scores 100 on a test and gets an A
- student 2 scores 90 on the same test and gets an A
- student 3 scores 89 on the same test and gets a B
one can argue that:
student #2 soft/thin A is not far from student #3 strong B and for all practical purposes they are almost the same!

To further clarify my question, is it possible that:
- oil A has a true 2.51W which is closer to 5W than 0W so it gets a classification 5W.
- oil B has a true 7.49W which is closer to 5W than 10W and get the same classification of 5W.
oil A and B are 4.98W apart but they are both classified as 5W.
based on that, can you conclude that oil A is a "thinner" 5W than oil B?

I also know that xW classifications jump from 0W to 5W and 10W, etc. and are not infinite and I understand why (it is not practical) but in real world, how can you force the oil/molecules to follow the 0, 5, 10W standard? hence 2.51W or 7.49W in my example.

This was basically my question. Not sure if it works this way and as I mentioned, maybe I am over simplifying or misunderstanding things.
again, I was not trying to reach a conclusion in my original post, it was a question which I thought may? explain the "thinner" oil theory!

Thank you!





If you want to make those types of distinctions, you can't use the W rating system, period. It's neither designed to, or capable of, conveying anything further about the oil than it's SAE J300 Winter classification.
You can compare oils in the way you want to, but you'll have to use the appropriate data like CCS/MRV/Temperature and possibly VI.

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#4676028 - 02/23/18 11:24 PM Re: brand x oil is thinner than brand y oil question [Re: PeterPolyol]
OilUzer Offline


Registered: 07/31/17
Posts: 136
Loc: WA
Originally Posted By: Garak
The real answer, or best answer, at least, is that the viscometric properties of a given oil will fall somewhere on SAE J300. Where they fall dictates how the oil is labelled. Certain things are also likely to go hand in hand. A 10w-30 ILSAC, for instance, will exceed the 10w-XX limits fairly handily (but will not meet the 5w-XX limits) and will have a lower HTHS, just above the minimums for the grade. A 10w-30 HDEO will exceed the 10-XX limits much more closely and have an HTHS of 3.5 or higher. So, the 10w-30 ILSAC would already be what you consider a 7.5w-30. Except, however, it's not, because if it's a 10-XX but not a 5w-XX, it has to be labelled as a 10w-XX, and if it's meeting 5w-XX requirements, it has to be labelled as 5w-XX.


Originally Posted By: PeterPolyol
If you want to make those types of distinctions, you can't use the W rating system, period. It's neither designed to, or capable of, conveying anything further about the oil than it's SAE J300 Winter classification.
You can compare oils in the way you want to, but you'll have to use the appropriate data like CCS/MRV/Temperature and possibly VI.


thank you guys!

it makes sense and kind of reaffirms my original intuition ...
btw, i had to lookup a lot abbreviations you guys throw at me! lol

it makes sense not to use xW rating in my logic!
i was trying to figure out why one 5W oil is different than other 5W (i used the word "thinner") and shouldn't have used the existing standards for my example. it was easier using the xW system to convey my point but i can see that it is not a good analogy (discrete vs. continuous) and xW system is not a continuous system!

i assume we can conclude that:
basically if 2 oils are pigeonholed into a given grade/classification, it doesn't make them equal!

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