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#4498790 - 08/26/17 03:55 PM mixing synthetic and non-synthetic oil
bella1 Offline


Registered: 08/26/17
Posts: 1
Loc: Baltimore County
my 2008 toyota tacoma calls for 6.3 quarts of 0W-20 oil. I added a 5 qt container of 0W-20 synthetic blend, and then topped off with 1 qt of 5-W20 conventional oil. Is that okay to mix?

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#4498797 - 08/26/17 03:59 PM Re: mixing synthetic and non-synthetic oil [Re: bella1]
Warstud Online   content


Registered: 09/02/05
Posts: 5389
Loc: MIchigan
Perfectly fine. That synthetic blend is mostly conventional anyway. You just diluted it even more.

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#4498798 - 08/26/17 04:00 PM Re: mixing synthetic and non-synthetic oil [Re: bella1]
bioburner Offline


Registered: 09/19/16
Posts: 1418
Loc: Minnesota
You just added more non synthetic to the already low amount of synthetic of the blend. No problem
Warstud beat me


Edited by bioburner (08/26/17 04:01 PM)
_________________________

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#4498808 - 08/26/17 04:20 PM Re: mixing synthetic and non-synthetic oil [Re: bella1]
CT8 Offline


Registered: 10/09/14
Posts: 10920
Loc: Idaho
Why ask? Just curious.
_________________________
"Don't let your preconceived notions get in the way of facts."Geoff Metcalf"

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#4498809 - 08/26/17 04:22 PM Re: mixing synthetic and non-synthetic oil [Re: bella1]
AirgunSavant Offline


Registered: 07/22/15
Posts: 3772
Loc: MD
Pennzoil now addresses this on their website.

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#4498819 - 08/26/17 04:40 PM Re: mixing synthetic and non-synthetic oil [Re: bella1]
FermeLaPorte Offline


Registered: 07/25/17
Posts: 466
Loc: Texas (south)
The mix is ok. It is mostly 0w20 so no problem there. Had it been something like diesel motor oil 5w40 and then 0w20, well, it would be a different story
_________________________
Always Mobil 1
2014 1.6L Nissan Versa Sedan, 5 spd, 5k OCI.
2011 3.5L Chevrolet Impala, Automatic, 5k OCI.

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#4498845 - 08/26/17 05:24 PM Re: mixing synthetic and non-synthetic oil [Re: CT8]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 3965
Loc: New England
Originally Posted By: CT8
Why ask? Just curious.


Lots of FUD about mixing the two has been spread around...I had a guy at a Midas tell me that I could never go back to using conventional if I switched to synthetic in my RAV4. He gave me a bit of a shock but I guessed that he was probably full of it, and I was right.
The very existence of synthetic blends tells us that mixing the two is OK.
_________________________
2014 Forester XT, 80500 miles
Last Change;
Valvoline Full Synthetic 5W30 d1G2
Tokyo Roki 15208AA170 filter

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#4498851 - 08/26/17 05:35 PM Re: mixing synthetic and non-synthetic oil [Re: bella1]
SirTanon Offline


Registered: 06/23/14
Posts: 2137
Loc: Phoenix, Arizona - USA
I do this all the time.. sometimes I mix conventional with synblend, sometimes I mix conventional with full synthetic, and sometimes I mix syn blend with synthetic..

.. heck, I've even mixed "high-mileage" with conventional, syn-blend, or synthetic.

Never had what I felt was a bad UOA using any of these.

For what it's worth, this UOA below was (I think) a mix of Castrol Synblend, Valvoline NextGen Maxlife, and Valvoline NextGen conventional... some was 5w30 and some was 5w20.. as you can see, the results were just fine:

_________________________
2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 256,000mi
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#4498977 - 08/26/17 09:16 PM Re: mixing synthetic and non-synthetic oil [Re: bella1]
blupupher Offline


Registered: 08/27/04
Posts: 4414
Loc: Katy, Republic of Texas
Many "conventional" oils are a blend anyway, so no harm done.
The cost of "syn blend" (how much syn, nobody is telling) is not justified for what you get.

No harm done, no real benefit either.

I have mixed blends, conventional and synthetic. It is oil in my engine, that is what matters most.
_________________________
1994 Honda VT1100C: Peak 15w-40/TG/2500 mile OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI


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#4499284 - 08/27/17 09:41 AM Re: mixing synthetic and non-synthetic oil [Re: bella1]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2376
Loc: Balearic Islands , Spain
No problem at all.
_________________________
1975 Ford Capri II Ghia 3000 V6, - Valvoline VR1 20W-50
1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Shell Rimula R4X 15W-40 HDEO.

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