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Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 #5260041 11/06/19 04:41 PM
Joined: Feb 2019
Posts: 10
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Fanatichuman Offline OP
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Joined: Feb 2019
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Hi all,

I switched to Rotella T6 but have a rest of Castrol 0w40 Euro formula left. I'm filled up with T6, but can I top up the T6 from time to time with a bit of the 0w40 Castrol?
This is on a BMW e46 M54B30. I am on the central OR coast, so it just gets a bit below freezing a few days in the winter. No really low temps.

Cheers,
fana

Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: Fanatichuman] #5260101 11/06/19 06:13 PM
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paoester Offline
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Maybe reduced optimality if there is some minor additive clash. People do it all the time, mixing a little of other types or brands of oil. I've never heard of any problem with it. I say fine.

Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: Fanatichuman] #5260266 11/06/19 09:18 PM
Joined: Aug 2019
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tundraotto Offline
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Why not just top it off with the T6 you have switched to instead......

Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: Fanatichuman] #5260360 11/06/19 11:53 PM
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Dylan1303 Offline
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A word to those running Rotella T6 and other HDEOs in gasoline engines because some loudmouth on BITOG or some forum told you to. Don't. I used to tell this to people all the time; that HDEOs don't belong in gasoline engines, but I've learned a lot more lately as to specifically why that is the case.

Reason 1: Primary ZDDP. What most people just call Zinc, ZDDP is an additive package in oil that is known for anti-wear properties. I'll spare you the science behind ZDDP decomposition tiers and the nature of boundary lubrication, but what you have to realize is that there are 200+ formulations of ZDDP and they are not all equal. They come in two main categories: primary and secondary. Primary ZDDP is used mostly as an antioxidant to fight oxidative thickening in engine oils in high-heat applications, of which there are plenty in diesel engines, and is also geared more for lower friction coefficient. By contrast, gasoline engines either use mostly secondary ZDDP with some primary, or exclusively secondary (which is the case of higher quality oils), and is geared more for tribofilm formulation. Basically, your 1200ppm of Zinc in Rotella T6 is not actually protecting better than 800ppm of Zinc API SN spec synthetic oil and certainly not better than a high secondary ZDDP formulated gasoline engine oil.

Reason 2: Anti-foaming. Also referred to as air release, the oil has to release air pockets generated during friction and movement. Rotella is not very good at this, and that's OK when you are running a Detroit Diesel with a 2100RPM redline or even a 6.7 Powestroke with a 3400RPM redline (where the anti-foaming starts to become a bigger issue), not so much when you're running a Subaru FA20 with a 7400RPM redline. Under extended use, this can eventually aerate the fluid enough to cause catastrophic failure, or at minimum power loss.

Reason 3: Detergents/Dispersants. Diesel engines typically deal more with soot handling and dispersion, so the additive package is designed accordingly. On the other hand, gasoline engine detergent packs are designed more to handle acidity. This discrepancy can also result in reduced performance in gasoline engines as the detergent tries to clean the cylinder walls, which compromises the seal between rings and cylinder walls and reduces compression and efficiency.


Now I'm sure I'll get the classic "I've been using this oil and nothing has blown up yet" rhetoric by people who are too cheap to consider better options like AMSOIL, Driven Racing, Motul, and Schaeffer, but that doesn't mean that the product doesn't have its deficiencies simply because you want it to work. I realize people have a higher tendency to believe information that they agree with regarding a cheaper product than a more expensive one, but unless you already knew everything I presented in this post, you ought to reconsider your lubricant choice in gasoline engines (especially high-revving and turbo gasoline engines). There are far better options on the market.


12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
19 cruze auto 1.4t amsoil oe 5w20 tuned on 24psi
Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: Fanatichuman] #5260378 11/07/19 12:23 AM
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cos Offline
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popcorn


'15 Cadillac SRX
- Castrol Magnatec 5W30
- Valvoline Maxlife ATF





Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: Dylan1303] #5260384 11/07/19 12:37 AM
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Dyusik Offline
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Originally Posted by Dylan1303

This discrepancy can also result in reduced performance in gasoline engines as the detergent tries to clean the cylinder walls, which compromises the seal between rings and cylinder walls and reduces compression and efficiency.

What are you smoking? So a Cummins ISB with a 19:1, and a turbo blowing 35 psi, think about what you said. And #2. is not a fact. At over 15,000 RPM with a gearbox involved, I can say there is 0 foaming.

Not arguing, but where is this misinformation coming from?


95 Cherokee 190K DELO XLE 10W30, XG8
04 YZF-R1 21K RT6 15w40, XG7317
18 RAM 3500 15k Delvac 15w40, DBL7349
96 Cherokee
Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: Dyusik] #5260387 11/07/19 12:42 AM
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Dylan1303 Offline
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Originally Posted by Dyusik
Originally Posted by Dylan1303

This discrepancy can also result in reduced performance in gasoline engines as the detergent tries to clean the cylinder walls, which compromises the seal between rings and cylinder walls and reduces compression and efficiency.

What are you smoking? So a Cummins ISB with a 19:1, and a turbo blowing 35 psi, think about what you said. And #2. is not a fact. At over 15,000 RPM with a gearbox involved, I can say there is 0 foaming.

Not arguing, but where is this misinformation coming from?


Resources:
https://link.springer.com/article/10.1007/s11249-016-0706-7
https://link.springer.com/article/10.1023/B:TRIL.0000044495.26882.b5
https://www.stle.org/images/pdf/STL...unction%20of%20Lubricant%20Additives.pdf
https://www.machinerylubrication.com/Read/31107/oil-lubricant-additives
https://www.machinerylubrication.com/Read/28576/comparing-gasoline-diesel-engine-oils-
https://www.stle.org/images/pdf/STLE_ORG/Newsletter/2019/TL/FilmThicknessAndFrictionOfZDDP.pdf


12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
19 cruze auto 1.4t amsoil oe 5w20 tuned on 24psi
Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: Fanatichuman] #5260590 11/07/19 10:01 AM
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paoester Offline
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Dylan1303, take a look at a fleet average (many) sample iron Fe wear & other study done by Blackstone, and notice Rotella T6 did very well, at or near the top of each item.
https://jalopnik.com/why-expensive-oil-is-a-waste-of-money-1797241527

jalponik.jpg
Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: paoester] #5260926 11/07/19 04:07 PM
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Dylan1303 Offline
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Originally Posted by paoester
Dylan1303, take a look at a fleet average (many) sample iron Fe wear & other study done by Blackstone, and notice Rotella T6 did very well, at or near the top of each item.
https://jalopnik.com/why-expensive-oil-is-a-waste-of-money-1797241527


You didnt get viscosity tested? I bet the t6 sheared out of grade. Only going 3-4k on oil is wasting it. Especially amsoil ss. Also just because your uoa came back good, doesn't mean the oil is protecting like it should.


12 cruze rs 1.4t 6spd pp 5w30 tuned on 22psi
19 cruze auto 1.4t amsoil oe 5w20 tuned on 24psi
Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: Dylan1303] #5261730 11/08/19 12:47 PM
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thunderchild Offline
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This was a good post! Cheers2 Dylan1303!

Last edited by thunderchild; 11/08/19 12:48 PM. Reason: Add some text.

2004 Chevrolet Tahoe 5.3 4x4
2008 BMW X5 3.0si 4x4
2010 Volvo XC90 3.2 4x4

Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: Fanatichuman] #5261754 11/08/19 01:21 PM
Joined: Apr 2019
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D1dad Offline
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What if the hdeo is SN rated?

Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: Dylan1303] #5261969 11/08/19 06:42 PM
Joined: Aug 2019
Posts: 643
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paoester Offline
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Posts: 643
Originally Posted by Dylan1303
Originally Posted by paoester
Dylan1303, take a look at a fleet average (many) sample iron Fe wear & other study done by Blackstone, and notice Rotella T6 did very well, at or near the top of each item.
https://jalopnik.com/why-expensive-oil-is-a-waste-of-money-1797241527
You didnt get viscosity tested? I bet the t6 sheared out of grade. Only going 3-4k on oil is wasting it. Especially amsoil ss. Also just because your uoa came back good, doesn't mean the oil is protecting like it should.
Not my UOAs. You are looking at dozens of runs from each oil pictured. That is a Blackstone Labs published data set. Wear items are there.

Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: Dylan1303] #5262369 11/09/19 09:15 AM
Joined: Sep 2018
Posts: 145
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LeoStrop Offline
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Originally Posted by Dylan1303
A word to those running Rotella T6 and other HDEOs in gasoline engines because some loudmouth on BITOG or some forum told you to. Don't. I used to tell this to people all the time; that HDEOs don't belong in gasoline engines, but I've learned a lot more lately as to specifically why that is the case.

Reason 1: Primary ZDDP. What most people just call Zinc, ZDDP is an additive package in oil that is known for anti-wear properties. I'll spare you the science behind ZDDP decomposition tiers and the nature of boundary lubrication, but what you have to realize is that there are 200+ formulations of ZDDP and they are not all equal. They come in two main categories: primary and secondary. Primary ZDDP is used mostly as an antioxidant to fight oxidative thickening in engine oils in high-heat applications, of which there are plenty in diesel engines, and is also geared more for lower friction coefficient. By contrast, gasoline engines either use mostly secondary ZDDP with some primary, or exclusively secondary (which is the case of higher quality oils), and is geared more for tribofilm formulation. Basically, your 1200ppm of Zinc in Rotella T6 is not actually protecting better than 800ppm of Zinc API SN spec synthetic oil and certainly not better than a high secondary ZDDP formulated gasoline engine oil.

Reason 2: Anti-foaming. Also referred to as air release, the oil has to release air pockets generated during friction and movement. Rotella is not very good at this, and that's OK when you are running a Detroit Diesel with a 2100RPM redline or even a 6.7 Powestroke with a 3400RPM redline (where the anti-foaming starts to become a bigger issue), not so much when you're running a Subaru FA20 with a 7400RPM redline. Under extended use, this can eventually aerate the fluid enough to cause catastrophic failure, or at minimum power loss.

Reason 3: Detergents/Dispersants. Diesel engines typically deal more with soot handling and dispersion, so the additive package is designed accordingly. On the other hand, gasoline engine detergent packs are designed more to handle acidity. This discrepancy can also result in reduced performance in gasoline engines as the detergent tries to clean the cylinder walls, which compromises the seal between rings and cylinder walls and reduces compression and efficiency.


Now I'm sure I'll get the classic "I've been using this oil and nothing has blown up yet" rhetoric by people who are too cheap to consider better options like AMSOIL, Driven Racing, Motul, and Schaeffer, but that doesn't mean that the product doesn't have its deficiencies simply because you want it to work. I realize people have a higher tendency to believe information that they agree with regarding a cheaper product than a more expensive one, but unless you already knew everything I presented in this post, you ought to reconsider your lubricant choice in gasoline engines (especially high-revving and turbo gasoline engines). There are far better options on the market.


Are you this guy, or are you just copying his post?

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/5246334/1

Last edited by LeoStrop; 11/09/19 09:18 AM.

Chevrolet Kadett EFI '94 (Neat ethanol) - Shell Rimula RT4X 15W40

Honda Fit '09 (FlexFuel) - Shell Helix HX8 5W30 > Motul 6100 SYN-nergy 5W30
Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: LeoStrop] #5262375 11/09/19 09:30 AM
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kschachn Offline
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Yeah I saw that too.

There are individuals on here that wish to portray a lot of things.


1994 BMW 530i, 252K
1996 Honda Accord, 288K
1999 Toyota Sienna, 434K
2000 Toyota ECHO, 284K
Re: Mix Rotella T6 5w40 with rest of Euro Castrol 0w40 [Re: D1dad] #5262400 11/09/19 10:01 AM
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tundraotto Offline
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Originally Posted by D1dad
What if the hdeo is SN rated?


^ This - plenty of diesel oils are SN rated.....LeoStrop is misinformed.

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