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#4672658 - 02/21/18 02:27 AM Mixing TGMO 0w20 and Castrol Euro 0w40!
FranklinJL Offline


Registered: 09/23/14
Posts: 119
Loc: AZ
Couldn't resist the sale online of castrol 0w40. I tow a 21ft bassboat all over the southwest, running 75-80. I run a 2018 tundra 5.7 1794. Have always used 5w30 or 0w30. GC, or whatever mobil 1 was on sale.

?. How do I get something close to 30wt with 5 quarts of 0w40 and 0w20? I know mixing even doesnt always work.Thanks


Edited by FranklinJL (02/21/18 02:31 AM)
_________________________
2018 Tundra 1794
2013 S63
And a few other fast cars....

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#4672663 - 02/21/18 02:42 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL]
FordBroncoVWJeta Offline


Registered: 04/16/16
Posts: 769
Loc: KS
2018 Tundra? That depends, would you like to keep your warranty in tact?
_________________________
17 Volkswagen Jetta 1.4T
15 Honda CRV 2.4
12 Volkswagen Jetta 2.0
01 Pontiac Sunfire 2.2

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#4672667 - 02/21/18 03:00 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL]
Triple_Se7en Offline


Registered: 12/04/04
Posts: 8778
Loc: 1/2 hr. north of Detroit
Originally Posted By: FranklinJL
Couldn't resist the sale online of castrol 0w40. I tow a 21ft bassboat all over the southwest, running 75-80. I run a 2018 tundra 5.7 1794. Have always used 5w30 or 0w30. GC, or whatever mobil 1 was on sale.

?. How do I get something close to 30wt with 5 quarts of 0w40 and 0w20? I know mixing even doesnt always work.Thanks

Mix half and half for 0w-30 range.
I've been home-blending for 25 years. Won't reduce your engine lifetime at all. Won't increase consumption or noise either.
I am a first and last owner of all my vehicles. That's proof it works spendid.

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#4672678 - 02/21/18 04:50 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL]
OilUzer Offline


Registered: 07/31/17
Posts: 138
Loc: WA
it is not what you are asking but I learned today that 50/50 mix of xW-30 and yW-30 does not produce ((x+y)/2)W-30!

Originally Posted By: FordBroncoVWJeta
2018 Tundra? That depends, would you like to keep your warranty in tact?


not trying to hijack the thread but am curious about your Tundra. Have you always used something other than specified 0W-20?
I have done a lot of research and it keeps leading me back to 0W-20. I was not comfortable with 0W-20 but it is growing on me ... lol

With southwest temperatures, I assume 0W vs. 5W is not as much of an issue. you don't see cold temps like Alaska!
but the 30 vs. 20 is what I am concerned about. I always wanted to use 5W-30 (vs. specified 0W-20) especially in the summer and if towing but haven't switched yet. at least not until the warranty is over. my research so far indicates that this engine likes 0W-20 and it is not just about fuel economy (CAFE). remember I said "so far", I am still working on it. Like to know what Toyota specifies for the same engine in hot climate outside US and if synthetic is not available and/or expensive in those countries ...

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#4672701 - 02/21/18 05:54 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL]
Hounds Offline


Registered: 03/19/09
Posts: 518
Loc: Hither & Yon
JL, you're an intrepid man! Coming onto BITOG and even hinting about mixing oil weights much less brands!
You, sir, are my hero.

Now, WRT to what you're going to end up with, you can start here: http://www.widman.biz/English/Calculators/Mixtures.html. Sir Widman's work will give you a "good" (not perfect) idea of what you'll end up with. (Hint: 50%-50% will give you pretty much what you expect.)

Oh, and you might wanna wrap your computer in a wet towel to prevent overheating when the High Priests of Miscibility are awakened. They don't take kindly to oil-mixers.

Excellent choice on that Castrol 0w-40 weight, btw.

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#4672703 - 02/21/18 06:00 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL]
Shannow Offline


Registered: 12/12/02
Posts: 39912
Loc: 'Stralia
meh...Arizona, you don't have to worry about two 0Ws making a 0W...

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#4672709 - 02/21/18 06:25 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL]
toneydoc Offline


Registered: 12/16/11
Posts: 1696
Loc: War Eagle
Mix it 50:50 and get on with the fishing
_________________________
1994 Jeep 158k Mobil 5000 5w30
2014 Camry 32k QS AD 5w30
2018 Jeep Cherokee 1k factory fill
2014 HD Ultra 35k Mobil1 15w50
2012 Rav4 35k PP 5w20

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#4672711 - 02/21/18 06:34 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL]
Smoqueed Offline


Registered: 12/24/16
Posts: 92
Loc: Indiana, USA
Just pour the Castrol 0w40 in, it's close enough to a 30 weight anyways! Now if you're just trying to use old stock up, probably somewhere between 50-50 and 75(GC)-25(TGMO) would net you an actual 30 weight.

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#4672719 - 02/21/18 06:44 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1407
Loc: Jacksonville, FL
Sure you could do it, but why not just use the 0w40 straight? I would.
_________________________
Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander

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#4672721 - 02/21/18 06:47 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FlyNavyP3]
Patman Online   content



Registered: 05/27/02
Posts: 20347
Loc: Oakville, Ontario
Originally Posted By: FlyNavyP3
Sure you could do it, but why not just use the 0w40 straight? I would.


And he can kiss the powertrain warranty goodbye too.
_________________________
2018 Corvette (M1 5w30 ESP & Fram Ultra)
2006 Civic EX Coupe (PUP 5w20 & Fram Ultra)
2010 BMW 328i X-Drive (GC 0w40 & Mann)


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#4672726 - 02/21/18 06:56 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 3970
Loc: New England
The OPer says he tows a lot, is there anything about using thicker oils for severe service in the manual for the Tundra?
_________________________
2014 Forester XT, 80500 miles
Last Change;
Valvoline Full Synthetic 5W30 d1G2
Tokyo Roki 15208AA170 filter

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#4672741 - 02/21/18 07:08 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: Virtus_Probi]
OilUzer Offline


Registered: 07/31/17
Posts: 138
Loc: WA
Originally Posted By: Virtus_Probi
The OPer says he tows a lot, is there anything about using thicker oils for severe service in the manual for the Tundra?


no, 0w-20 only!

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#4672794 - 02/21/18 08:16 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: OilUzer]
dernp Offline


Registered: 10/18/12
Posts: 519
Loc: SW Fla
5.7L Tundra? Bullet proof. Run whatever.
_________________________
2014 Honda Civic 1.8 28k TGMO 0w20
2016 Honda Civic 1.5T Mobil 1 0w20
2011 Tundra 5.7L 83k TGMO



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#4672909 - 02/21/18 09:33 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL]
69GTX Offline


Registered: 09/23/15
Posts: 3815
Loc: Connecticut
Last I checked, the Castrol 0w-40 Euro is a lower calcium, higher magnesium brew. That's not easy to find in 20/30 grades unless you go to Mobil 1. Then you're mixing different oil base stocks too. Whatever you mix, you're either going to be altering the add pack, or the type of oil.

Last I checked, the lower grades of Castrol are all non-magnesium, higher calcium. Though they do seem to alter these every few years. If you can find some older Castrol Edge 20 grade (pre-2016?) those are probably magnesium oils.
_________________________
----------------

2001 Lincoln Cont 4.6L DOHC/ 39K mi / QS HM 5w30 / FUG XG2
1999 Camaro SS M6 /19K /Mobil 1 0w40 /Fram UG /GM MTL-ATF
1969 Ply GTX/RRs

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#4672925 - 02/21/18 09:44 AM Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: 69GTX]
kschachn Offline


Registered: 12/26/05
Posts: 9417
Loc: Upper Midwest
Originally Posted By: 69GTX
Last I checked, the Castrol 0w-40 Euro is a lower calcium, higher magnesium brew. That's not easy to find in 20/30 grades unless you go to Mobil 1. Then you're mixing different oil base stocks too. Whatever you mix, you're either going to be altering the add pack, or the type of oil.

Last I checked, the lower grades of Castrol are all non-magnesium, higher calcium. Though they do seem to alter these every few years. If you can find some older Castrol Edge 20 grade (pre-2016?) those are probably magnesium oils.

I've always thought that a far more serious potential of mixing is the loss of any certification, rather than some unknown ending viscosity.
_________________________
1994 BMW 530i, 227K
1996 Honda Accord, 262K
1999 Toyota Sienna, 394K
2000 Toyota ECHO, 267K

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