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Mixing Rotella t5 10w-30 #4690720
03/10/18 06:12 PM
03/10/18 06:12 PM
Joined: Mar 2018
Posts: 3
New England
PaulManDude Offline OP
PaulManDude  Offline OP
Joined: Mar 2018
Posts: 3
New England
Can I mix Rotella t5 10w-30 with something like a 0w-20 to thin it out a bit and make a thinner 30 weight? Rotella 10w-30 is very heavy, almost like a 40 weight, correct? Would the cold flowing properties still be a 10 weight?


Horn went “Beep”
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Re: Mixing Rotella t5 10w-30 [Re: PaulManDude] #4690728
03/10/18 06:19 PM
03/10/18 06:19 PM
Joined: Sep 2015
Posts: 5,839
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,839
Kalifornia Kollective
Not all that close to 40 ... It looks and feels heavy to the thin oil crowd. Looks and feels about right to the thick crowd smile

If I wanted to thin it out some, I'd just use some Shell SAE 10, or something along those lines. Jobber should have Rotella 10 or 20 mono-grades in stock smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Mixing Rotella t5 10w-30 [Re: PaulManDude] #4690750
03/10/18 06:48 PM
03/10/18 06:48 PM
Joined: Jun 2011
Posts: 1,755
Crawfordville FL
SilverFusion2010 Offline
SilverFusion2010  Offline
Joined: Jun 2011
Posts: 1,755
Crawfordville FL
When you mix you end up with an unknown. It will probably be thinner at 100C but the cold end will be unknown


2010 Ford Fusion SE 3.0L V6, 178k miles M1 HM 10w-30
Re: Mixing Rotella t5 10w-30 [Re: PaulManDude] #4690778
03/10/18 07:30 PM
03/10/18 07:30 PM
Joined: Mar 2008
Posts: 6,799
USA
slacktide_bitog Online content
slacktide_bitog  Online Content
Joined: Mar 2008
Posts: 6,799
USA
Shell now makes a Rotella T6 5w30, which may suit your needs better smile

Re: Mixing Rotella t5 10w-30 [Re: PaulManDude] #4690784
03/10/18 07:43 PM
03/10/18 07:43 PM
Joined: Dec 2005
Posts: 9,874
Upper Midwest
kschachn Online content
kschachn  Online Content
Joined: Dec 2005
Posts: 9,874
Upper Midwest
Originally Posted By: PaulManDude
Can I mix Rotella t5 10w-30 with something like a 0w-20 to thin it out a bit and make a thinner 30 weight? Rotella 10w-30 is very heavy, almost like a 40 weight, correct? Would the cold flowing properties still be a 10 weight?

"10W" does not mean it is a 10-weight oil, in fact there is no SAE 10 grade oil. Within the somewhat messy confines of this thread you will see that the "W" is a cold-cranking rating, not a weight. Mixed oils do not guarantee any cold cranking specification will be met:

https://www.bobistheoilguy.com/forums/ubbthreads.php/topics/4672607/1

Plus when you mix oils (especially those of widely different chemistries) you also produce a mixture that has no certifications. There's no guarantee it will meet any of the certs or standards that any of the individual oils may individually meet. Do like slacktide_bitog mentioned and buy an oil that meets your engine certification requirements and is appropriate for the anticipated operating conditions.


1994 BMW 530i, 228K
1996 Honda Accord, 263K
1999 Toyota Sienna, 400K
2000 Toyota ECHO, 271K
Re: Mixing Rotella t5 10w-30 [Re: kschachn] #4690886
03/10/18 09:30 PM
03/10/18 09:30 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
Originally Posted By: kschachn

Plus when you mix oils (especially those of widely different chemistries) you also produce a mixture that has no certifications. There's no guarantee it will meet any of the certs or standards that any of the individual oils may individually meet.


I'll bet that doesn't happen in real life very often, though.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Mixing Rotella t5 10w-30 [Re: Linctex] #4690887
03/10/18 09:32 PM
03/10/18 09:32 PM
Joined: Apr 2008
Posts: 37,093
Ontario, Canada
OVERKILL Offline
OVERKILL  Offline
Joined: Apr 2008
Posts: 37,093
Ontario, Canada
Originally Posted By: Linctex
Originally Posted By: kschachn

Plus when you mix oils (especially those of widely different chemistries) you also produce a mixture that has no certifications. There's no guarantee it will meet any of the certs or standards that any of the individual oils may individually meet.


I'll bet that doesn't happen in real life very often, though.


What doesn't? No mix is certified, by mixing you modify the formula that was approved, ergo, your "new" product is approved to absolutely no standard.


2018 RAM 1500 Big Horn EcoDiesel
2016 Grand Cherokee SRT
Re: Mixing Rotella t5 10w-30 [Re: PaulManDude] #4690912
03/10/18 09:49 PM
03/10/18 09:49 PM
Joined: Jul 2013
Posts: 278
Chicago suburbs
AP9 Offline
AP9  Offline
Joined: Jul 2013
Posts: 278
Chicago suburbs
It's a nonlinear relationship. As mentioned earlier, that will drop the viscosity @ 100°C significantly more than the cold-temp viscosity. Mixing 1:1, it would end up closer to a "10W20" than a "5W20" or "5W30"


2000 Ford Explorer XLT 4WD (4.0L OHV): VML 20W50+PP 10W30+T5 10W30+Peak 5W30/10W40, burning oil faster than a 2-cycle
1996 Chevrolet Impala SS: M1HM 5W30
Re: Mixing Rotella t5 10w-30 [Re: OVERKILL] #4690915
03/10/18 09:54 PM
03/10/18 09:54 PM
Joined: Dec 2005
Posts: 9,874
Upper Midwest
kschachn Online content
kschachn  Online Content
Joined: Dec 2005
Posts: 9,874
Upper Midwest
Originally Posted By: Linctex
I'll bet that doesn't happen in real life very often, though.

Without specific insider knowledge of the formulation I'd say the argument could better be made that it happens every time.


1994 BMW 530i, 228K
1996 Honda Accord, 263K
1999 Toyota Sienna, 400K
2000 Toyota ECHO, 271K
Re: Mixing Rotella t5 10w-30 [Re: OVERKILL] #4691107
03/11/18 07:00 AM
03/11/18 07:00 AM
Joined: Dec 2004
Posts: 9,318
1/2 hr N.E. of Detroit
Triple_Se7en Offline
Triple_Se7en  Offline
Joined: Dec 2004
Posts: 9,318
1/2 hr N.E. of Detroit
Originally Posted By: OVERKILL
Originally Posted By: Linctex
Originally Posted By: kschachn

Plus when you mix oils (especially those of widely different chemistries) you also produce a mixture that has no certifications. There's no guarantee it will meet any of the certs or standards that any of the individual oils may individually meet.


I'll bet that doesn't happen in real life very often, though.


What doesn't? No mix is certified, by mixing you modify the formula that was approved, ergo, your "new" product is approved to absolutely no standard.


Mixing doesn't hurt a thing. It has the same odds to improve things - as it does to flat-line. There's absolutely no proof mixing harms or lowers the life of the engine.

My engines are proof of that after almost 25 years of mixing. I'm even more proof.... being I am first & last owner of my vehicles. I've taken 18 year-old vehicles to junkyards badly rusted. Still have a clear dipstick - still only use a half-quart in OCI - still do not smoke. Engines are in great shape.... outside of the rest of the vehicle parts.
Mix-away..... blend away....... get better benefit of your hard-earned money by blending 50-50 for the same money that you paid for that 25-33% synthetic blend that bottlers gave you.

My current blend is 5w-30 Formula Shell conventional with Quaker State Ultimate Durability synthetic. One bought for 1.79qt at Menards and one bought for 2.13qt equivalent at Meijer.

Last edited by Triple_Se7en; 03/11/18 07:11 AM.

She's the only sister-in-law I have. But she's not my favorite.
Re: Mixing Rotella t5 10w-30 [Re: Triple_Se7en] #4691248
03/11/18 09:44 AM
03/11/18 09:44 AM
Joined: Dec 2005
Posts: 9,874
Upper Midwest
kschachn Online content
kschachn  Online Content
Joined: Dec 2005
Posts: 9,874
Upper Midwest
Originally Posted By: Triple_Se7en
Mixing doesn't hurt a thing. It has the same odds to improve things - as it does to flat-line. There's absolutely no proof mixing harms or lowers the life of the engine.

My engines are proof of that after almost 25 years of mixing. I'm even more proof.... being I am first & last owner of my vehicles. I've taken 18 year-old vehicles to junkyards badly rusted. Still have a clear dipstick - still only use a half-quart in OCI - still do not smoke. Engines are in great shape.... outside of the rest of the vehicle parts..

The first part is correct but the second half of your statement is pure silliness. You're nothing but a blind formulator with no knowledge of additive chemistry at that point.


1994 BMW 530i, 228K
1996 Honda Accord, 263K
1999 Toyota Sienna, 400K
2000 Toyota ECHO, 271K
Re: Mixing Rotella t5 10w-30 [Re: PaulManDude] #4691315
03/11/18 10:38 AM
03/11/18 10:38 AM
Joined: Oct 2015
Posts: 2,650
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline
Joined: Oct 2015
Posts: 2,650
Balearic Islands , Spain
If you wanted to water id won a bit perhaps add some of that new Rotella 5W-30


1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.

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