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Mixing TGMO 0w20 and Castrol Euro 0w40! #4672658
02/21/18 03:27 AM
02/21/18 03:27 AM
Joined: Sep 2014
Posts: 119
AZ
FranklinJL Offline OP
FranklinJL  Offline OP
Joined: Sep 2014
Posts: 119
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

Last edited by FranklinJL; 02/21/18 03:31 AM.

2018 Tundra 1794
2013 S63
And a few other fast cars....
Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL] #4672663
02/21/18 03:42 AM
02/21/18 03:42 AM
Joined: Apr 2016
Posts: 845
KS
FordBroncoVWJeta Offline
FordBroncoVWJeta  Offline
Joined: Apr 2016
Posts: 845
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
Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL] #4672667
02/21/18 04:00 AM
02/21/18 04:00 AM
Joined: Dec 2004
Posts: 9,330
1/2 hr N.E. of Detroit
Triple_Se7en Offline
Triple_Se7en  Offline
Joined: Dec 2004
Posts: 9,330
1/2 hr N.E. 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.


She's the only sister-in-law I have. But she's not my favorite.
Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL] #4672678
02/21/18 05:50 AM
02/21/18 05:50 AM
Joined: Jul 2017
Posts: 315
WA
OilUzer Offline
OilUzer  Offline
Joined: Jul 2017
Posts: 315
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 ...

Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL] #4672701
02/21/18 06:54 AM
02/21/18 06:54 AM
Joined: Mar 2009
Posts: 527
Hither & Yon
Hounds Offline
Hounds  Offline
Joined: Mar 2009
Posts: 527
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.

Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL] #4672703
02/21/18 07:00 AM
02/21/18 07:00 AM
Joined: Dec 2002
Posts: 40,884
'Stralia
Shannow Offline
Shannow  Offline
Joined: Dec 2002
Posts: 40,884
'Stralia
meh...Arizona, you don't have to worry about two 0Ws making a 0W...

Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL] #4672709
02/21/18 07:25 AM
02/21/18 07:25 AM
Joined: Dec 2011
Posts: 1,732
War Eagle
toneydoc Offline
toneydoc  Offline
Joined: Dec 2011
Posts: 1,732
War Eagle
Mix it 50:50 and get on with the fishing


1994 Jeep 159k Mobil 5000 5w30
2014 Camry 34k Havoline 5w20
2018 Jeep Cherokee 2k FactFill
2014 HD Ultra 40k Mobil1 15w50
2012 Rav4 37k Pennzoil Platinum 5w20
Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL] #4672711
02/21/18 07:34 AM
02/21/18 07:34 AM
Joined: Dec 2016
Posts: 94
Indiana, USA
Smoqueed Offline
Smoqueed  Offline
Joined: Dec 2016
Posts: 94
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.

Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL] #4672719
02/21/18 07:44 AM
02/21/18 07:44 AM
Joined: Jul 2016
Posts: 1,481
Jacksonville, FL
FlyNavyP3 Offline
FlyNavyP3  Offline
Joined: Jul 2016
Posts: 1,481
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
Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FlyNavyP3] #4672721
02/21/18 07:47 AM
02/21/18 07:47 AM
Joined: May 2002
Posts: 20,788
Oakville, Ontario
Patman Offline
Patman  Offline
Joined: May 2002
Posts: 20,788
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 Formula & Fram Ultra)
2006 Civic EX Coupe (PUP 5w20 & Fram Ultra)
2010 BMW 328i X-Drive (GC 0w40 & Fram Ultra)

Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL] #4672726
02/21/18 07:56 AM
02/21/18 07:56 AM
Joined: Jun 2015
Posts: 4,225
New England
Virtus_Probi Offline
Virtus_Probi  Offline
Joined: Jun 2015
Posts: 4,225
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, 86000 miles
Last Change;
M1 5W30 d1G2
Tokyo Roki 15208AA170 filter
Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: Virtus_Probi] #4672741
02/21/18 08:08 AM
02/21/18 08:08 AM
Joined: Jul 2017
Posts: 315
WA
OilUzer Offline
OilUzer  Offline
Joined: Jul 2017
Posts: 315
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!

Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: OilUzer] #4672794
02/21/18 09:16 AM
02/21/18 09:16 AM
Joined: Oct 2012
Posts: 519
SW Fla
dernp Offline
dernp  Offline
Joined: Oct 2012
Posts: 519
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


Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: FranklinJL] #4672909
02/21/18 10:33 AM
02/21/18 10:33 AM
Joined: Sep 2015
Posts: 3,861
Connecticut
69GTX Offline
69GTX  Offline
Joined: Sep 2015
Posts: 3,861
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
Re: Mixing TGMO 0w20 and Castrol Euro 0w40! [Re: 69GTX] #4672925
02/21/18 10:44 AM
02/21/18 10:44 AM
Joined: Dec 2005
Posts: 9,898
Upper Midwest
kschachn Offline
kschachn  Offline
Joined: Dec 2005
Posts: 9,898
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, 228K
1996 Honda Accord, 263K
1999 Toyota Sienna, 400K
2000 Toyota ECHO, 271K
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