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#4513520 - 09/11/17 05:53 PM How to calculate mixed oil/multi grade/straight ?
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: 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?


Edited by leroyd92 (09/11/17 05:54 PM)
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#4513534 - 09/11/17 06:07 PM Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92]
A_Harman Offline


Registered: 10/01/10
Posts: 6921
Loc: 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.


Edited by A_Harman (09/11/17 06:09 PM)
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#4513560 - 09/11/17 06:33 PM Re: How to calculate mixed oil/multi grade/straight ? [Re: A_Harman]
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: AZ
I stated 6.5 quarts of 10w30 and 16 0z of straight 60 wt


Edited by leroyd92 (09/11/17 06:34 PM)
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#4513563 - 09/11/17 06:36 PM Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35885
Loc: 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
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#4513571 - 09/11/17 06:40 PM Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92]
CT8 Offline


Registered: 10/09/14
Posts: 11009
Loc: Idaho
The oil mixture became half a quart of 60wt and 6.5 quarts of 10w30.
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#4513604 - 09/11/17 07:29 PM Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92]
philipp10 Offline


Registered: 05/09/14
Posts: 1182
Loc: 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


Edited by philipp10 (09/11/17 07:31 PM)

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#4513687 - 09/11/17 08:56 PM Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92]
Linctex Offline


Registered: 12/31/16
Posts: 6160
Loc: Waco, TX
In that P30 454 engine motorhome in AZ?
... just dump the whole quart of 60 in.
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#4513689 - 09/11/17 08:57 PM Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92]
Linctex Offline


Registered: 12/31/16
Posts: 6160
Loc: Waco, TX
Oh... my W.A.G. will be a 12W-34
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#4513956 - 09/12/17 07:17 AM Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92]
Ammofirst Offline


Registered: 06/22/17
Posts: 353
Loc: Western usa
I'd bet my left nut your engine won't care

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#4513960 - 09/12/17 07:23 AM Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92]
Shannow Online   content


Registered: 12/12/02
Posts: 39919
Loc: '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 ???)

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#4514488 - 09/12/17 07:10 PM Re: How to calculate mixed oil/multi grade/straight ? [Re: Shannow]
leroyd92 Offline


Registered: 01/21/14
Posts: 494
Loc: 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 ?


Edited by leroyd92 (09/12/17 07:13 PM)
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#4514735 - 09/13/17 12:06 AM Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92]
beanoil Offline


Registered: 10/17/04
Posts: 2956
Loc: 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...)


Edited by beanoil (09/13/17 12:10 AM)
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#4514838 - 09/13/17 06:51 AM Re: How to calculate mixed oil/multi grade/straight ? [Re: leroyd92]
SonofJoe Offline


Registered: 07/23/16
Posts: 1052
Loc: 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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