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#4576935 - 11/17/17 10:01 AM Used 0w20 instead of 5w40
AVG Offline


Registered: 11/16/17
Posts: 6
Loc: Toronto, Ontario
Hi there, I'm hoping you can advise me on correcting a mistake I made.

I have a VW GLI with a 2.0 TSI that calls for VW 502/3/4 5w30 or 40 synthetic. I accidentally added our Subaru Outback oil, which is 0w20 synthetic, about 1 to 1.5 litres. I am about 5,000 km away from a service, which should be in the dead of winter. Should I worry about this, and change the oil now? Or is there an averaging effect, where 5w40 gets diluted down to 4w30 or something like that? I'm guessing not, that a part of the oil will behave differently than the rest of the oil. I've tried to read up on how viscosity works, but don't understand when thin is too thin.

Any help would be appreciated.

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#4576947 - 11/17/17 10:12 AM Re: Used 0w20 instead of 5w40 [Re: AVG]
jaj Offline


Registered: 08/21/03
Posts: 1060
Loc: Vancouver, Canada
Originally Posted By: AVG
Hi there, I'm hoping you can advise me on correcting a mistake I made.

I have a VW GLI with a 2.0 TSI that calls for VW 502/3/4 5w30 or 40 synthetic. I accidentally added our Subaru Outback oil, which is 0w20 synthetic, about 1 to 1.5 litres. I am about 5,000 km away from a service, which should be in the dead of winter. Should I worry about this, and change the oil now? Or is there an averaging effect, where 5w40 gets diluted down to 4w30 or something like that? I'm guessing not, that a part of the oil will behave differently than the rest of the oil. I've tried to read up on how viscosity works, but don't understand when thin is too thin.

Any help would be appreciated.


If you've got a 4.5 liter oil capacity in the engine, it'll be fine. The specs are intended for worst-case use in hot weather on fast highways. You won't be facing either in Toronto any time soon, so your engine won't notice. If you've poured in a quality synthetic 0w20, don't fret.

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#4576954 - 11/17/17 10:15 AM Re: Used 0w20 instead of 5w40 [Re: AVG]
knerml Offline


Registered: 04/05/05
Posts: 479
Loc: NE Ohio
I would change the oil. In my experience, VW/Audi turbos run hot. It's not really all that cold in Toronto.
_________________________
2015 Hyundai Elantra Sport 2.0 GDI Mobil 1 5W20 & OEM/Mann W811/80 Filter
2018 Hyundai Santa Fe Sport 2.0T GDI Castrol Edge 5W40 & OEM/Mann W811/80 Filter

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#4576974 - 11/17/17 10:29 AM Re: Used 0w20 instead of 5w40 [Re: AVG]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 3970
Loc: New England
The oils will be miscible (blend into each other) and will just result in a composite oil that will likely be a bit thinner than the 5W40 would have been at all temperatures. Might start just a bit better in the cold but also give you just a little bit less protection if the oil temps get very high for some reason.

If you really did blend the 0W20 with a 5W40 and 5W30 is also allowed for your engine, I'd guess there isn't that much to worry about. If it's going to drive you crazy or you just like being extra careful, then go ahead and change it.
_________________________
2014 Forester XT, 80500 miles
Last Change;
Valvoline Full Synthetic 5W30 d1G2
Tokyo Roki 15208AA170 filter

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#4576978 - 11/17/17 10:34 AM Re: Used 0w20 instead of 5w40 [Re: knerml]
jaj Offline


Registered: 08/21/03
Posts: 1060
Loc: Vancouver, Canada
Originally Posted By: knerml
I would change the oil. In my experience, VW/Audi turbos run hot. It's not really all that cold in Toronto.


The first reason I wouldn't worry about it is that from 2016, BMW turbo engines in non-M cars are spec'd for 0w-20 from the factory. Same engine in earlier model years was 5w-30.

The second reason I wouldn't worry is that even if 1/3 of the sump oil is 0w-20, the running viscosity in a warm engine is probably still more than 9.3 cSt at 100C, which means it's still a 30 weight oil, and that meets the viscosity spec from VW.


Edited by jaj (11/17/17 10:35 AM)

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#4576996 - 11/17/17 10:50 AM Re: Used 0w20 instead of 5w40 [Re: AVG]
rooflessVW Online   content


Registered: 12/24/11
Posts: 4038
Loc: North Carolina
Just drain the oil.

Chalk it up as a mistake and fix it properly.
_________________________
"Zed's dead baby, Zed's dead."

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#4577004 - 11/17/17 11:02 AM Re: Used 0w20 instead of 5w40 [Re: AVG]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11964
Loc: N.H, U.S.A.
Listen for odd or excessive engine noise cold and hot - it she's as quiet as before then you are good to go. I would knock back the soft redline 1000 rpm short.
You likely made a 5W30, there are no "in between" numbers and available oil viscosity in the 30 grade range is all over the place.
_________________________
2014 Nissan Rogue S CVT, OC#9 41392mi-QSUD10W30 + M110A CHAMP Filter; 2017 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter

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#4577012 - 11/17/17 11:08 AM Re: Used 0w20 instead of 5w40 [Re: AVG]
judsonj Offline


Registered: 04/06/12
Posts: 50
Loc: nh
Here is a summary so far:

Change it
Don't change it
You probably should change it
You probably shouldn't worry about it

Hope this helps smile

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#4577033 - 11/17/17 11:31 AM Re: Used 0w20 instead of 5w40 [Re: judsonj]
jaj Offline


Registered: 08/21/03
Posts: 1060
Loc: Vancouver, Canada
Originally Posted By: judsonj
Here is a summary so far:

Change it
Don't change it
You probably should change it
You probably shouldn't worry about it

Hope this helps smile



This forum is famous for its clear and simple responses to just about any question.

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#4577059 - 11/17/17 12:11 PM Re: Used 0w20 instead of 5w40 [Re: jaj]
AVG Offline


Registered: 11/16/17
Posts: 6
Loc: Toronto, Ontario
Wow, thanks all for the quick and lively debate! Somebody said I should expect as much. I liked hearing the techeese, and understand a bit more about oil considerations. I've gained confidence that I'm not facing imminent disaster, at least. But in the absence of consensus I am giving in to my tendency to do-what-the-dealer-tells-you. I'm overdue for new plugs anyways, so may as well do the full service now.

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#4577066 - 11/17/17 12:24 PM Re: Used 0w20 instead of 5w40 [Re: AVG]
tig1 Offline


Registered: 01/03/09
Posts: 13657
Loc: Illinois
Can't remember who it is, but they have a MB that calls for a 40wt oil and they use M1 0-20 and their engine performs very well.
_________________________
2007 Ford Fusion 227,000 miles
M1 0-20 EP
2017 Ford Fusion 49K
M1 0-20 EP
10,000 mile OCIs on both engines
M1 ATF and MC LV
M1 10-30 in all OPE
MC filters


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#4577067 - 11/17/17 12:26 PM Re: Used 0w20 instead of 5w40 [Re: tig1]
jaj Offline


Registered: 08/21/03
Posts: 1060
Loc: Vancouver, Canada
Originally Posted By: tig1
Can't remember who it is, but they have a MB that calls for a 40wt oil and they use M1 0-20 and their engine performs very well.


Dr. Haas runs 5w20 in his Ferrari Enzo.

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#4577073 - 11/17/17 12:36 PM Re: Used 0w20 instead of 5w40 [Re: AVG]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Take the car to a shop that does PCM tuning and have them install a 2000 RPM rev limiter to the PCM.
As long as the engine is kept below 2000 RPM, it should be OK.

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#4577095 - 11/17/17 01:06 PM Re: Used 0w20 instead of 5w40 [Re: AVG]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2378
Loc: Balearic Islands , Spain
I would change it.
_________________________
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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#4577104 - 11/17/17 01:13 PM Re: Used 0w20 instead of 5w40 [Re: AVG]
1JZ_E46 Offline


Registered: 04/04/16
Posts: 1224
Loc: Oregon
If you came here looking for a definitive answer, you’re not going to find it.
_________________________
2007 BMW X5 4.8i, 105K: Castrol EDGE 0W-40, Mann
2012 Mini Cooper, 45K: Castrol EDGE 0W-30, Mann

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