Pennzoil - SN Plus and 0W-16 Q&A

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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?

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

Registered: 09/02/05
Posts: 5096
Loc: MIchigan
Perfectly fine. That synthetic blend is mostly conventional anyway. You just diluted it even more.

#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)

97 Ford E350 D,99 F350 dually D
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13 Madass

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

Registered: 10/09/14
Posts: 10382
Loc: Idaho
Why ask? Just curious.
Artificial intelligence is no match for natural stupidity, we shall prevail

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

Registered: 07/22/15
Posts: 3588
Loc: MD
Pennzoil now addresses this on their website.

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

Registered: 07/25/17
Posts: 365
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.

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

Registered: 06/25/15
Posts: 3413
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, 75300 miles
Last Change;
Pennzoil Gold 5W30 d1G2
Tokyo Roki 15208AA170 filter

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

Registered: 06/23/14
Posts: 1885
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 - 250,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 50,000mi

#4498977 - 08/26/17 09:16 PM Re: mixing synthetic and non-synthetic oil [Re: bella1]
blupupher Offline

Registered: 08/27/04
Posts: 4262
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.
'94 VT1100C/Peak 15w40/TG/3k
'02 F150/GTX HM 5w20/EG Syn/1yr

'12 xB/QSUD 0w20/CQ Blue/5k

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

Registered: 10/22/15
Posts: 2271
Loc: Balearic Islands , Spain
No problem at all.
1975 Ford Capri II Ghia 3000 V6
1988 Ford Escort 1.6 Xr3i Convertible
1999 Peugeot 106 1.1i Max
Finnish expat living in Spain