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Mixing Oils #5207776 09/08/19 01:52 PM
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Mr_Luke Online Content OP
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I've learned enough from here and YT so that I will feel good about adding leftover new oils to my Ford Fiesta in 2020 when I do my next OCI. I have about 1 quart of leftover PYB 5w30, and about 1 qt of NAPA 5w30 SB, and will add 2 qts of Super tech 5w30 FS. That's going to be my oil cocktail, with a new Fram PH3614 filter. I'm anticipating the coming of that great day, LOL. I was actually going to recycle the leftover oils until I saw how some of the engines fared better on cocktails like this than they did with one type of oil.


2016 Ford Fiesta SE 1.6L; 58k
Quaker State Advanced Durability 5w20
Federated PG241F
Re: Mixing Oils [Re: Mr_Luke] #5207807 09/08/19 02:29 PM
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kschachn Offline
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Where did you see that an engine “fared better” on a cocktail of oils? That’s not possible via a UOA.


1994 BMW 530i, 250K
1996 Honda Accord, 280K
1999 Toyota Sienna, 425K
2000 Toyota ECHO, 284K
Re: Mixing Oils [Re: Mr_Luke] #5207824 09/08/19 02:55 PM
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Railrust Offline
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Hmm...this is my thoughts...it really won't matter either way, especially on a 3,000-5,000 mile run. So have fun. And like I always say...if it makes you feel good, do it.

Re: Mixing Oils [Re: Mr_Luke] #5207845 09/08/19 03:26 PM
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Mix away, all oil are compatible with each other, you are not going to ruin an engine mixing, but not going to make it last longer either.

Just be aware that your viscosity will not be precise if mixing weights, but since your just mixing 5w-30 of different brands, not an issue.


5k OCI: '18 Santa Fe: PP 10W-30/OEM, '18 Soul: Mobil Super 5W-20/OEM
1yr OCI: '12 xB: M1 EP 0W-20/CQ Blue, '02 F150: Magnatec 5W-20/Bosch D+, '94 VT1100: Peak 15W-40/Bosch D+
Re: Mixing Oils [Re: Mr_Luke] #5207853 09/08/19 03:35 PM
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ka9mnx Online Content
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I'm not a believer of deliberately mixing oil. Top off in a pinch ok. I wouldn't even mix oils for my 255k mile 26 year old F150. But that's probably why my vehicles got to where they are with trouble-free miles.


2005 Ranger 3.0 - SuperTech Syn 5w-30/Motorcraft
2000 4Runner 3.4 - SuperTech Syn 5w-30/Toyota
1997 B2500 Van 3.9 - M1 HM 10w-30/Mopar
1993 F150 4.9 - SuperTech Syn 5w-30/Motorcraft
Re: Mixing Oils [Re: kschachn] #5207884 09/08/19 04:03 PM
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Mr_Luke Online Content OP
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Originally Posted by kschachn
Where did you see that an engine “fared better” on a cocktail of oils? That’s not possible via a UOA.


On a youtube video on my TV.


2016 Ford Fiesta SE 1.6L; 58k
Quaker State Advanced Durability 5w20
Federated PG241F
Re: Mixing Oils [Re: Mr_Luke] #5207887 09/08/19 04:04 PM
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Mr_Luke Online Content OP
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I'm just doing this next time to get rid of a few leftover oils I have sitting around, then I'll be using mostly all the same oils per OCI.


2016 Ford Fiesta SE 1.6L; 58k
Quaker State Advanced Durability 5w20
Federated PG241F
Re: Mixing Oils [Re: Mr_Luke] #5207892 09/08/19 04:14 PM
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csandste Offline
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Don't think it makes much difference although the only oil burning on my Soul was when i threw a half quart of Harvest King 5w30 syn on top of some 5w20 Maxlife. Half quart in 6000 miles. Probably more about the 5w20.

Last edited by csandste; 09/08/19 04:15 PM.

2017 Kia Soul Plus-- VWB 5w30-- 70,000 miles
Re: Mixing Oils [Re: Mr_Luke] #5207967 09/08/19 06:20 PM
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kschachn Offline
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Originally Posted by Mr_Luke
Originally Posted by kschachn
Where did you see that an engine “fared better” on a cocktail of oils? That’s not possible via a UOA.

On a youtube video on my TV.

Yeah, hmm.

Making stuff up just to create a post on Bitog isn't nice.


1994 BMW 530i, 250K
1996 Honda Accord, 280K
1999 Toyota Sienna, 425K
2000 Toyota ECHO, 284K
Re: Mixing Oils [Re: blupupher] #5208181 09/09/19 02:42 AM
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Originally Posted by blupupher
Mix away, all oil are compatible with each other, you are not going to ruin an engine mixing, but not going to make it last longer either.


^^^ Pretty much 100% end of the thread, right here ^^^


"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 Oils [Re: blupupher] #5208184 09/09/19 03:12 AM
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Shannow Online Content
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Originally Posted by blupupher
Mix away, all oil are compatible with each other, you are not going to ruin an engine mixing, but not going to make it last longer either.

Just be aware that your viscosity will not be precise if mixing weights, but since your just mixing 5w-30 of different brands, not an issue.


Compatible is simply that they mix, can be cooled to the combined freeze point, and then heated to 150C, and then cooled back to the freeze point with 7 reference oils, and they don't split like salad dressing or blow chunks of precipitate.

That's ALL that the compatibility test offers.

It doesn't offer that any two 5W30s when mixed will be a 5W30 (in partiular the 5W part), nor that a 0W20 and 0W40 will have a 0W at the start of it. In fact, all off the serious failures (and there have been a few), it was the "W" end of the spectrum that failed, in the Toyota factory fill case, with an incompatible service fill, the "W" grade became so bad that the engines couldn't pump the oil at any sort of reasonable temperature.

Extremely rare, and in a warm climate, seriously unlikely to cause any issue.

But if you are in 0W country, and you NEED 0W, the Myagi defence applies...best defence is no be there.


If it's the truth....it can handle the pressure !!!
Re: Mixing Oils [Re: Mr_Luke] #5208187 09/09/19 03:30 AM
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Originally Posted by Shannow

It doesn't offer that any two 5W30s when mixed will be a 5W30 (in partiular the 5W part), nor that a 0W20 and 0W40 will have a 0W at the start of it. In fact, all off the serious failures (and there have been a few), it was the "W" end of the spectrum that failed, in the Toyota factory fill case, with an incompatible service fill, the "W" grade became so bad that the engines couldn't pump the oil at any sort of reasonable temperature.

Would that be as a result of some kind of incompatibility in PPD's??.. inquiring minds want to know!😂

Last edited by Mad_Hatter; 09/09/19 03:30 AM.
Re: Mixing Oils [Re: Mad_Hatter] #5208194 09/09/19 03:49 AM
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Shannow Online Content
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Yep, PPDs, Viscosity Modifiers, and other "waxy" additives.


If it's the truth....it can handle the pressure !!!
Re: Mixing Oils [Re: Shannow] #5208325 09/09/19 08:17 AM
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Originally Posted by Shannow
Yep, PPDs, Viscosity Modifiers, and other "waxy" additives.

Tx..👍

Re: Mixing Oils [Re: Mad_Hatter] #5209682 09/10/19 09:18 PM
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Rav4H2019 Offline
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What was the incompatible service fill for toyota

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