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#4672364 - 02/20/18 07:35 PM 7.5Wx30 Oil
OilUzer Offline


Registered: 07/31/17
Posts: 136
Loc: WA
does 50/50 mix of 5Wx30 and 10Wx30 produce 7.5Wx30?

for example mixing Pennzoil platinum full synthetic 5Wx30 with 10Wx30
does it produce PP 7.5Wx30 (based on Pennzoil standards). I know some oils run thinner/thicker than others ...

Q2: is it bad to mix if you have left-overs?

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#4672365 - 02/20/18 07:36 PM Re: 7.5Wx30 Oil [Re: OilUzer]
kschachn Online   content


Registered: 12/26/05
Posts: 9390
Loc: Upper Midwest
Originally Posted By: OilUzer
does 50/50 mix of 5Wx30 and 10Wx30 produce 7.5Wx30?

for example mixing Pennzoil platinum full synthetic 5Wx30 with 10Wx30
does it produce PP 7.5Wx30 (based on Pennzoil standards). I know some oils run thinner/thicker than others ...

Q2: is it bad to mix if you have left-overs?


No, and no.
_________________________
1994 BMW 530i, 227K
1996 Honda Accord, 262K
1999 Toyota Sienna, 394K
2000 Toyota ECHO, 267K

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#4672378 - 02/20/18 07:47 PM Re: 7.5Wx30 Oil [Re: OilUzer]
OVERKILL Offline


Registered: 04/28/08
Posts: 36428
Loc: Ontario, Canada
There is no such grade. It'll be either a 5w-30 or a 10w-30. Probably the latter.

Mixing is not optimal, but it isn't going to hurt anything.
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2016 Durango Limited
2016 Grand Cherokee SRT

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#4672379 - 02/20/18 07:48 PM Re: 7.5Wx30 Oil [Re: OilUzer]
OilUzer Offline


Registered: 07/31/17
Posts: 136
Loc: WA
Thank you!
what would the weight be then? it is not 10W and it is not 5W?
can you analyze fresh oil to figure out what weight it is? is there such a system like UOA for new oil. I am sure different companies may analyze each other's oil ...

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#4672384 - 02/20/18 07:51 PM Re: 7.5Wx30 Oil [Re: OilUzer]
OVERKILL Offline


Registered: 04/28/08
Posts: 36428
Loc: Ontario, Canada
Originally Posted By: OilUzer
Thank you!
what would the weight be then? it is not 10W and it is not 5W?
can you analyze fresh oil to figure out what weight it is? is there such a system like UOA for new oil. I am sure different companies may analyze each other's oil ...


The number in front of the W is not a grade/weight, it is simply a qualification of the oil's cold temperature performance.

The number after the W is the grade, and since both are 30's, the end result will be a 30.
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#4672388 - 02/20/18 07:56 PM Re: 7.5Wx30 Oil [Re: OilUzer]
JimPghPA Offline


Registered: 08/22/09
Posts: 3859
Loc: Pittsburgh,PA U.S.A.
When you mix oils with different W ratings it does not produce an oil that is an average of the oils mixed.

The problem is that the molecules of the oil with the higher W number will still turn into a wax at the same temperature they originally did before mixing.

In other words 10W oil molecules turn to wax at certain temperature, and those molecules will still turn to wax at the same temperature even if the oil is mixed with 5W or 0W. You will have molecules that turn into wax from the 10W mixed with molecules that will not turn into wax until they are much colder.

So no, mixing 10W with 5W does not yield 7.5W.

And no, mixing 10W with 0W does not yield 5W.

And no, mixing 5W with 0W does not yield 2.5W.


Edited by JimPghPA (02/20/18 08:02 PM)
_________________________
Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa


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#4672391 - 02/20/18 08:01 PM Re: 7.5Wx30 Oil [Re: JimPghPA]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Originally Posted By: JimPghPA


...The problem is that the molecules of the oil with the higher W number will still turn into a wax at the same temperature they originally did before mixing.

In other words 10W oil molecules turn to wax at certain temperature, and those molecules will still turn to wax at the same temperature even is the oil is mixed with 5W or 0W. You will have molecules that turn into wax from the 10W mixed with molecules that will not turn into wax until they are much colder...



How are you defining WAX?

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#4672392 - 02/20/18 08:02 PM Re: 7.5Wx30 Oil [Re: OVERKILL]
kschachn Online   content


Registered: 12/26/05
Posts: 9390
Loc: Upper Midwest
Originally Posted By: OVERKILL
The number in front of the W is not a grade/weight, it is simply a qualification of the oil's cold temperature performance.

The number after the W is the grade, and since both are 30's, the end result will be a 30.

Thank you, for the 8,000,000th time.
_________________________
1994 BMW 530i, 227K
1996 Honda Accord, 262K
1999 Toyota Sienna, 394K
2000 Toyota ECHO, 267K

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#4672413 - 02/20/18 08:12 PM Re: 7.5Wx30 Oil [Re: MolaKule]
JimPghPA Offline


Registered: 08/22/09
Posts: 3859
Loc: Pittsburgh,PA U.S.A.
Originally Posted By: MolaKule
Originally Posted By: JimPghPA


...The problem is that the molecules of the oil with the higher W number will still turn into a wax at the same temperature they originally did before mixing.

In other words 10W oil molecules turn to wax at certain temperature, and those molecules will still turn to wax at the same temperature even is the oil is mixed with 5W or 0W. You will have molecules that turn into wax from the 10W mixed with molecules that will not turn into wax until they are much colder...



How are you defining WAX?


Well, actually if you had pure 100% of those molecules they would become so thick that you could literally turn the container on its side or even upside down and they would not run.

The molecules do not flex or flow freely when they are cold enough to become wax.
_________________________
Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa


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#4672415 - 02/20/18 08:13 PM Re: 7.5Wx30 Oil [Re: JimPghPA]
JLTD Offline


Registered: 12/15/17
Posts: 644
Loc: US
Originally Posted By: JimPghPA
When you mix oils with different W ratings it does not produce an oil that is an average of the oils mixed.

The problem is that the molecules of the oil with the higher W number will still turn into a wax at the same temperature they originally did before mixing.

In other words 10W oil molecules turn to wax at certain temperature, and those molecules will still turn to wax at the same temperature even if the oil is mixed with 5W or 0W. You will have molecules that turn into wax from the 10W mixed with molecules that will not turn into wax until they are much colder.

So no, mixing 10W with 5W does not yield 7.5W.

And no, mixing 10W with 0W does not yield 5W.

And no, mixing 5W with 0W does not yield 2.5W.


Right...by the math it's 7.5, but the oil will likely perform in extreme cold as a 10w.
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Testing vs Amsoil OE 5w30...then longer OCI on SS

Hers: 2008 Jeep Liberty 134k, Amsoil SS 5w30/Amsoil, minimum 10k oci

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#4672417 - 02/20/18 08:13 PM Re: 7.5Wx30 Oil [Re: kschachn]
BlueOvalFitter Offline


Registered: 02/28/03
Posts: 6003
Loc: Cajun Country, La.
Originally Posted By: kschachn
Originally Posted By: OVERKILL
The number in front of the W is not a grade/weight, it is simply a qualification of the oil's cold temperature performance.

The number after the W is the grade, and since both are 30's, the end result will be a 30.

Thank you, for the 8,000,000th time.

OVERKILL, I don't think you're getting through to member kschachn. Maybe if you post it ONCE more he "MIGHT" get it then. crackmeup hide hornets

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#4672421 - 02/20/18 08:15 PM Re: 7.5Wx30 Oil [Re: kschachn]
OVERKILL Offline


Registered: 04/28/08
Posts: 36428
Loc: Ontario, Canada
Originally Posted By: kschachn
Originally Posted By: OVERKILL
The number in front of the W is not a grade/weight, it is simply a qualification of the oil's cold temperature performance.

The number after the W is the grade, and since both are 30's, the end result will be a 30.

Thank you, for the 8,000,000th time.


LOL grin
_________________________
2016 Durango Limited
2016 Grand Cherokee SRT

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#4672426 - 02/20/18 08:20 PM Re: 7.5Wx30 Oil [Re: kschachn]
OilUzer Offline


Registered: 07/31/17
Posts: 136
Loc: WA
I guess I was focusing too much on the math than the science of oil. seems like you can get a phd in oil and still not know much about it ... lol
having said that, I would have liked a 7.5Wx30. can we ask Pennzoil to make some?


Edited by OilUzer (02/20/18 08:24 PM)

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#4672428 - 02/20/18 08:23 PM Re: 7.5Wx30 Oil [Re: OilUzer]
kschachn Online   content


Registered: 12/26/05
Posts: 9390
Loc: Upper Midwest
Originally Posted By: OilUzer
I guess I was focusing too much on the math than the science of oil. seems like you can get a phd in oil and still not know much about it ... lol
having said that, I would have liked a 7.5Wx30

What for?
_________________________
1994 BMW 530i, 227K
1996 Honda Accord, 262K
1999 Toyota Sienna, 394K
2000 Toyota ECHO, 267K

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#4672436 - 02/20/18 08:30 PM Re: 7.5Wx30 Oil [Re: kschachn]
OilUzer Offline


Registered: 07/31/17
Posts: 136
Loc: WA
I switch in summer to 10Wx30 and winter to 5Wx30. in my area we hardly go below 20F (maybe a few days max) and we hardly go over 95F (again not that often) but if I travel to other parts of state, we get into 100F in the summer ...
I am sure 5Wx30 or 10Wx30 is fine but I figured I do the math thing again and came up with 7.5W that way I don't have to buy both weights smile

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