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#4630560 - 01/10/18 02:14 PM Oil Brew/Blend Calculator?
maverickfhs Offline


Registered: 12/28/16
Posts: 2009
Loc: VA
I have seen many guys here make their own oil brew and mention, if 0W20 is mixed with 0W40 with 4/1 parts, it'll be close to 0W30 and what not terms of ratios...

Question is, how do you get that approximation of mixing blends?

Is there an online calculator for viscosity and all and for that what do I need?

Thanks for any advice and help thumbsup
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#4630566 - 01/10/18 02:18 PM Re: Oil Brew/Blend Calculator? [Re: maverickfhs]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2569
Loc: MN
http://www.widman.biz/English/Calculators/Calculators.html

What's interesting is that its not linear.
Example: Mix an 8 cSt oil 50% with an 11 cSt and you'd think you might get right in the middle, 9.5 cSt. You don't; its actually 9.36 cSt. (KV100 there).


Edited by oil_film_movies (01/10/18 02:23 PM)

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#4630574 - 01/10/18 02:24 PM Re: Oil Brew/Blend Calculator? [Re: oil_film_movies]
wemay Offline


Registered: 04/04/12
Posts: 8896
Loc: Southeast Florida
Originally Posted By: oil_film_movies
http://www.widman.biz/English/Calculators/Calculators.html

What's interesting is that its not linear.
Example: Mix an 8 cSt oil 50% with an 11 cSt and you'd think you might get right in the middle, 9.5 cSt. You don't; its actually 9.36 cSt. (KV100 there).


This^
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#4630575 - 01/10/18 02:24 PM Re: Oil Brew/Blend Calculator? [Re: oil_film_movies]
Dallas69 Offline


Registered: 02/11/14
Posts: 1664
Loc: Texas
That's close enough for me.
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#4630577 - 01/10/18 02:24 PM Re: Oil Brew/Blend Calculator? [Re: maverickfhs]
SatinSilver Offline


Registered: 01/24/08
Posts: 10179
Loc: OH
Originally Posted By: maverickfhs
I have seen many guys here make their own oil brew and mention, if 0W20 is mixed with 0W40 with 4/1 parts, it'll be close to 0W30 and what not terms of ratios...


I'm coming up with a 24 wt.

4x20 and 1x40 = 120

Divide that by 5 = 24.

When doing a blend to keep things stable I would only mix in one part of a different oil ideally. And stick to the same manufacturer and type if possible.

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#4630580 - 01/10/18 02:26 PM Re: Oil Brew/Blend Calculator? [Re: maverickfhs]
maverickfhs Offline


Registered: 12/28/16
Posts: 2009
Loc: VA
Thanks, is there any place where actual weights can be plugged in directly?

Like 20% of 20W50, 40% of 10W30 and 40% of 0W40, I am just curious, nothing crazy here smile
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#4630588 - 01/10/18 02:28 PM Re: Oil Brew/Blend Calculator? [Re: maverickfhs]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2569
Loc: MN
maverickfhs, No, I haven't seen anything where you put the SAE grades in directly.
You have to work with the actual cSt at 100 deg C or 40 deg C on the Widman tool.
This is probably because the J300 SAE viscosity tables allows a range of viscosities within a particular grade.

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#4630591 - 01/10/18 02:31 PM Re: Oil Brew/Blend Calculator? [Re: SatinSilver]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35885
Loc: Great Lakes
Originally Posted By: SatinSilver
Originally Posted By: maverickfhs
I have seen many guys here make their own oil brew and mention, if 0W20 is mixed with 0W40 with 4/1 parts, it'll be close to 0W30 and what not terms of ratios...


I'm coming up with a 24 wt.

4x20 and 1x40 = 120

Divide that by 5 = 24.

When doing a blend to keep things stable I would only mix in one part of a different oil ideally. And stick to the same manufacturer and type if possible.

Since the grades are just ranges, it's not particularly useful to employ them to calculate blended viscosity. It's much better to use actual viscosities of both oils in these calculations.
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#4630595 - 01/10/18 02:35 PM Re: Oil Brew/Blend Calculator? [Re: maverickfhs]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2569
Loc: MN
Take your example of mixing 4/1, mostly 0w20. That is 0w40 at 20%. Say both Mobil1.
Widman: plug in 8.7 cSt at 80% and 12.9 at 20% at 100 deg C. Result: 9.39 cSt.
Then notice its a "light" 0w30 since "30 weight SAE" is defined as 9.3 to 12.5 cSt.

The zeroW part is probably intact, as its a pumping requirement, and both 0w40 and 0w20 grades are typically made from light base oils (relative to their 5w cousins).

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#4630596 - 01/10/18 02:36 PM Re: Oil Brew/Blend Calculator? [Re: maverickfhs]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35885
Loc: Great Lakes
Originally Posted By: maverickfhs
Thanks, is there any place where actual weights can be plugged in directly?

That would be kind of pointless because each grade represents a fairly wide range of possible viscosities.
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#4630600 - 01/10/18 02:37 PM Re: Oil Brew/Blend Calculator? [Re: oil_film_movies]
maverickfhs Offline


Registered: 12/28/16
Posts: 2009
Loc: VA
Originally Posted By: oil_film_movies
Take your example of mixing 4/1, mostly 0w20. That is 0w40 at 20%. Say both Mobil1.
Widman: plug in 8.7 cSt at 80% and 12.9 at 20% at 100 deg C. Result: 9.39 cSt.
Then notice its a "light" 0w30 since "30 weight SAE" is defined as 9.3 to 12.5 cSt.

The zeroW part is probably intact, as its a pumping requirement, and both 0w40 and 0w20 grades are typically made from light base oils (relative to their 5w cousins).


Thanks very much, makes sense!!
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#4630605 - 01/10/18 02:40 PM Re: Oil Brew/Blend Calculator? [Re: maverickfhs]
oil_film_movies Offline


Registered: 06/13/16
Posts: 2569
Loc: MN
It gets tricky if you mix a 5w30 with a 0w30. I don't know if the result will be a 5w or a 0w when its cold. I assume linear proportional there.

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#4630607 - 01/10/18 02:42 PM Re: Oil Brew/Blend Calculator? [Re: maverickfhs]
maverickfhs Offline


Registered: 12/28/16
Posts: 2009
Loc: VA
So I have to know cST for each oil. Now, how can I find it for each specific oil type? Is it mentioned on the bottle or have to looks at the datasheet?
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#4630609 - 01/10/18 02:42 PM Re: Oil Brew/Blend Calculator? [Re: maverickfhs]
rooflessVW Offline


Registered: 12/24/11
Posts: 4078
Loc: North Carolina
I don't get it... What's wrong with just buying the oil your engine actually NEEDS, and just using that?
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#4630610 - 01/10/18 02:46 PM Re: Oil Brew/Blend Calculator? [Re: rooflessVW]
maverickfhs Offline


Registered: 12/28/16
Posts: 2009
Loc: VA
Originally Posted By: rooflessVW
I don't get it... What's wrong with just buying the oil your engine actually NEEDS, and just using that?


Sorry, just trying to learn it smile

I have enough oil in my stash to comfortably take care of all vehcile manufacturer recommended SAE grades for now.
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