Recent Topics
Any 'crazy UCL overdose' fans out there?
by addyguy
06/17/18 07:11 PM
Source for Castrol Edge Supercar 5w50 oil?
by Rainier42
06/17/18 06:50 PM
Cherry vs orange hand cleaner
by JHZR2
06/17/18 06:27 PM
Why buy low mileage tires?
by HowAboutThis
06/17/18 05:49 PM
Mercury 35-8M0065104 cut open w/ oil change pics
by dlundblad
06/17/18 05:37 PM
2019 Honda’s miniMOTOs (125cc)
by DuckRyder
06/17/18 05:18 PM
Car Sales Scammers on Letgo
by ZZman
06/17/18 04:18 PM
Air shocks or Timbren for trailer towing ?
by Oldtom
06/17/18 04:10 PM
Which coil for a 2002 Focus Zetec?
by slacktide_bitog
06/17/18 04:07 PM
Blink -Roadside assistance, any experience?
by MoneyJohn
06/17/18 03:22 PM
Some garage art!
by ls1mike
06/17/18 03:12 PM
California Law
by PiperOne
06/17/18 02:37 PM
honda vs tyc a/c condenser?
by researcher
06/17/18 02:31 PM
To all the Fathers out there.
by rollinpete
06/17/18 01:37 PM
'14 Mercedes E350 Coupe - Castrol Edge 0w40
by FlyPenFly
06/17/18 01:08 PM
2007 Chrysler 4.0L SOHC engine - why 10w-30 req'd?
by 92saturnsl2
06/17/18 12:54 PM
you can see my crack when I dismount a tire
by eljefino
06/17/18 12:44 PM
Mobil 1™ Synthetic LV ATF HP
by Cup of Joe
06/17/18 11:44 AM
Coolant Flush - '07 Pacifica 4.0L
by 92saturnsl2
06/17/18 11:34 AM
Pan Drop or Fluid Through Dipstick
by TheLawnRanger
06/17/18 11:32 AM
Newest Members
Piper58, dunlop0078, Truth_Syrup, rjohn37, omatik
65256 Registered Users
Who's Online
86 registered (2015_PSD, 4WD, 2009Edge, 1JZ_E46, 10 invisible), 1413 Guests and 39 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65256 Members
67 Forums
285482 Topics
4764486 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#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 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.

#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
13 Scion Xb
12 Ford Transit Connect
06 Nissan Xterra
03 K1200 BMW
07 Kawasaki KLR650
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: 10920
Loc: Idaho
Why ask? Just curious.
"Don't let your preconceived notions get in the way of facts."Geoff Metcalf"

#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.

#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.

#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

#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
2014 Nissan Altima SL - 2.5 liter/CVT - 54,500mi

#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

#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.