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7.5Wx30 Oil #4672364
02/20/18 07:35 PM
02/20/18 07:35 PM
Joined: Jul 2017
Posts: 509
WA
OilUzer Online content OP
OilUzer  Online Content OP
Joined: Jul 2017
Posts: 509
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?

Re: 7.5Wx30 Oil [Re: OilUzer] #4672365
02/20/18 07:36 PM
02/20/18 07:36 PM
Joined: Dec 2005
Posts: 10,329
Upper Midwest
kschachn Offline
kschachn  Offline
Joined: Dec 2005
Posts: 10,329
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, 238K
1996 Honda Accord, 266K
1999 Toyota Sienna, 407K
2000 Toyota ECHO, 280K
Re: 7.5Wx30 Oil [Re: OilUzer] #4672378
02/20/18 07:47 PM
02/20/18 07:47 PM
Joined: Apr 2008
Posts: 37,960
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 37,960
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.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: 7.5Wx30 Oil [Re: OilUzer] #4672379
02/20/18 07:48 PM
02/20/18 07:48 PM
Joined: Jul 2017
Posts: 509
WA
OilUzer Online content OP
OilUzer  Online Content OP
Joined: Jul 2017
Posts: 509
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 ...

Re: 7.5Wx30 Oil [Re: OilUzer] #4672384
02/20/18 07:51 PM
02/20/18 07:51 PM
Joined: Apr 2008
Posts: 37,960
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 37,960
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.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: 7.5Wx30 Oil [Re: OilUzer] #4672388
02/20/18 07:56 PM
02/20/18 07:56 PM
Joined: Aug 2009
Posts: 3,921
Pittsburgh,PA U.S.A.
JimPghPA Offline
JimPghPA  Offline
Joined: Aug 2009
Posts: 3,921
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.

Last edited by JimPghPA; 02/20/18 08:02 PM.

Boy will I be happy when ALL vehicles on public roads are autonomous.


JimPghPa

Re: 7.5Wx30 Oil [Re: JimPghPA] #4672391
02/20/18 08:01 PM
02/20/18 08:01 PM
Joined: Jun 2002
Posts: 19,526
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,526
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?


Scars remind us of where we have been, but do not have to dictate where we are going.
Re: 7.5Wx30 Oil [Re: OVERKILL] #4672392
02/20/18 08:02 PM
02/20/18 08:02 PM
Joined: Dec 2005
Posts: 10,329
Upper Midwest
kschachn Offline
kschachn  Offline
Joined: Dec 2005
Posts: 10,329
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, 238K
1996 Honda Accord, 266K
1999 Toyota Sienna, 407K
2000 Toyota ECHO, 280K
Re: 7.5Wx30 Oil [Re: MolaKule] #4672413
02/20/18 08:12 PM
02/20/18 08:12 PM
Joined: Aug 2009
Posts: 3,921
Pittsburgh,PA U.S.A.
JimPghPA Offline
JimPghPA  Offline
Joined: Aug 2009
Posts: 3,921
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

Re: 7.5Wx30 Oil [Re: JimPghPA] #4672415
02/20/18 08:13 PM
02/20/18 08:13 PM
Joined: Dec 2017
Posts: 1,334
US
JLTD Offline
JLTD  Offline
Joined: Dec 2017
Posts: 1,334
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.


I'm a thickie; assimilate
But 20s have their place

Using AMSOIL

Hers: 2008 Jeep Liberty 138k, SS 5w30/Amsoil

His: 2015 4Runner 41k, OE 5w30/Wix

Re: 7.5Wx30 Oil [Re: kschachn] #4672417
02/20/18 08:13 PM
02/20/18 08:13 PM
Joined: Feb 2003
Posts: 6,003
Cajun Country, La.
BlueOvalFitter Offline
BlueOvalFitter  Offline
Joined: Feb 2003
Posts: 6,003
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

Re: 7.5Wx30 Oil [Re: kschachn] #4672421
02/20/18 08:15 PM
02/20/18 08:15 PM
Joined: Apr 2008
Posts: 37,960
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 37,960
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


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: 7.5Wx30 Oil [Re: kschachn] #4672426
02/20/18 08:20 PM
02/20/18 08:20 PM
Joined: Jul 2017
Posts: 509
WA
OilUzer Online content OP
OilUzer  Online Content OP
Joined: Jul 2017
Posts: 509
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?

Last edited by OilUzer; 02/20/18 08:24 PM.
Re: 7.5Wx30 Oil [Re: OilUzer] #4672428
02/20/18 08:23 PM
02/20/18 08:23 PM
Joined: Dec 2005
Posts: 10,329
Upper Midwest
kschachn Offline
kschachn  Offline
Joined: Dec 2005
Posts: 10,329
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, 238K
1996 Honda Accord, 266K
1999 Toyota Sienna, 407K
2000 Toyota ECHO, 280K
Re: 7.5Wx30 Oil [Re: kschachn] #4672436
02/20/18 08:30 PM
02/20/18 08:30 PM
Joined: Jul 2017
Posts: 509
WA
OilUzer Online content OP
OilUzer  Online Content OP
Joined: Jul 2017
Posts: 509
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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