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How to calculate mixed oil/multi grade/straight ? #4513520
09/11/17 05:53 PM
09/11/17 05:53 PM
Joined: Jan 2014
Posts: 500
AZ
leroyd92 Offline OP
leroyd92  Offline OP
Joined: Jan 2014
Posts: 500
AZ
I added half a quart of 60wt to 6.5 quarts of 10w30.

What Did the new oil weight become?

And how can i calculate things like this in the future?

Last edited by leroyd92; 09/11/17 05:54 PM.

Supertech Junky
Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92] #4513534
09/11/17 06:07 PM
09/11/17 06:07 PM
Joined: Oct 2010
Posts: 7,002
Michigan
A_Harman Offline
A_Harman  Offline
Joined: Oct 2010
Posts: 7,002
Michigan
What are the actual viscosities of the oils that you used?

There are viscosity calculators online. You can search them out.

The high temperature viscosity will be the only thing you will be able to calculate.
The W-viscosity can only be guessed at.

Last edited by A_Harman; 09/11/17 06:09 PM.

1985 Z51 Corvette track car
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Re: How to calculate mixed oil/multi grade/straight ? [Re: A_Harman] #4513560
09/11/17 06:33 PM
09/11/17 06:33 PM
Joined: Jan 2014
Posts: 500
AZ
leroyd92 Offline OP
leroyd92  Offline OP
Joined: Jan 2014
Posts: 500
AZ
I stated 6.5 quarts of 10w30 and 16 0z of straight 60 wt

Last edited by leroyd92; 09/11/17 06:34 PM.

Supertech Junky
Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92] #4513563
09/11/17 06:36 PM
09/11/17 06:36 PM
Joined: Oct 2002
Posts: 36,301
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,301
Great Lakes
Originally Posted By: leroyd92
I stated 6.5 quarts of 10w30 and 16 0z of straight 60 wt

These are just grades. What we need is actual viscosities.

Once you find it out, then you can use this:

http://www.widman.biz/English/Calculators/Mixtures.html


'02 530i (Edge 0W-40)
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Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92] #4513571
09/11/17 06:40 PM
09/11/17 06:40 PM
Joined: Oct 2014
Posts: 11,849
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 11,849
Idaho
The oil mixture became half a quart of 60wt and 6.5 quarts of 10w30.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92] #4513604
09/11/17 07:29 PM
09/11/17 07:29 PM
Joined: May 2014
Posts: 1,232
Minnesota
philipp10 Offline
philipp10  Offline
Joined: May 2014
Posts: 1,232
Minnesota
Originally Posted By: leroyd92
I added half a quart of 60wt to 6.5 quarts of 10w30.

What Did the new oil weight become?

And how can i calculate things like this in the future?


Well this may not be perfect...I suppose viscosities should be used but this is close enough:

its a simple ratio: (.5 x 60) + (6.5 x 30) = 7.5X

so X = [(.5 x 60) + (6.5 x 30)]/7.5
solve for x you will get 32.14

Last edited by philipp10; 09/11/17 07:31 PM.
Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92] #4513687
09/11/17 08:56 PM
09/11/17 08:56 PM
Joined: Dec 2016
Posts: 6,238
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,238
Waco, TX
In that P30 454 engine motorhome in AZ?
... just dump the whole quart of 60 in.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92] #4513689
09/11/17 08:57 PM
09/11/17 08:57 PM
Joined: Dec 2016
Posts: 6,238
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,238
Waco, TX
Oh... my W.A.G. will be a 12W-34


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92] #4513956
09/12/17 07:17 AM
09/12/17 07:17 AM
Joined: Jun 2017
Posts: 388
Western usa
Ammofirst Offline
Ammofirst  Offline
Joined: Jun 2017
Posts: 388
Western usa
I'd bet my left nut your engine won't care

Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92] #4513960
09/12/17 07:23 AM
09/12/17 07:23 AM
Joined: Dec 2002
Posts: 40,887
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 40,887
'Stralia
Originally Posted By: leroyd92
I stated 6.5 quarts of 10w30 and 16 0z of straight 60 wt


and you were asked what the viscosities were...that's pertinent.

How about you just tell us what they (the oils that you used) were.

(besides, if you know the answer to the question that you asked, what is your desired outcome, and plan if the answer isn't what you thought ???)

Re: How to calculate mixed oil/multi grade/straight ? [Re: Shannow] #4514488
09/12/17 07:10 PM
09/12/17 07:10 PM
Joined: Jan 2014
Posts: 500
AZ
leroyd92 Offline OP
leroyd92  Offline OP
Joined: Jan 2014
Posts: 500
AZ
Originally Posted By: Shannow
Originally Posted By: leroyd92
I stated 6.5 quarts of 10w30 and 16 0z of straight 60 wt


and you were asked what the viscosities were...that's pertinent.

How about you just tell us what they (the oils that you used) were.



(besides, if you know the answer to the question that you asked, what is your desired outcome, and plan if the answer isn't what you thought ???)



Ok, i clearly don't know how to answer that.

Where can i learn this information? Virgin oil tests or Castrol ?

Last edited by leroyd92; 09/12/17 07:13 PM.

Supertech Junky
Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92] #4514735
09/13/17 12:06 AM
09/13/17 12:06 AM
Joined: Oct 2004
Posts: 3,078
Midwest, Illinois
beanoil Offline
beanoil  Offline
Joined: Oct 2004
Posts: 3,078
Midwest, Illinois
Castrol, Valvoline, whoever will have PDS on their website for the product line.
You'll be looking for viscosity at both common stated temps, 40c and 100c.
Take this for example... Valvoline Conventional
Now head on over to the viscosity calculator HERE
and plug in the percentages of the two oils, and the viscosities.
Now you can compare that with the chart on the BITOG homepage, Get yur visco info heah....
You can also use this info to blend up oils from AZ, AA, and OR sales to get a workable viscosity for your application. Say, thinning out some .33 a quart 20w50 for something that can run a 10w30. (Yes some of us are still working through a stash of really cheap 20w50...)

Last edited by beanoil; 09/13/17 12:10 AM.

beanoil: Tough under heat, real dirty afterwards.
Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92] #4514838
09/13/17 06:51 AM
09/13/17 06:51 AM
Joined: Jul 2016
Posts: 1,090
Europe
SonofJoe Offline
SonofJoe  Offline
Joined: Jul 2016
Posts: 1,090
Europe
A few words here on how to blend viscosities of oils with disparate W-rating...

https://bobistheoilguy.com/forums/ubbthreads.php/topics/4262383/Re:_Mixing_5w30_+_20w50_=_what#Post4262383

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