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#4596986 - 12/07/17 10:06 AM Mixing grades
Swift101 Offline


Registered: 11/14/13
Posts: 386
Loc: NYC
Hey Everyone,

I just took my Sonata to the dealer to complete an engine recall. They needed to test the engine for knock and other issues since they claim a certain amount of engines from the 2011-2014 Sonata model years are defective. I'll provide a link below which has more detail on the problem. Basically their fix it to install a shorter dip stick which increase the oil sump capacity from 5.0 to 5.2 quarts. In my opinion it's a terrible fix because it doesn't guarantee anything, only increases oil pressure. But the issue is I always use M1 or Castrol 0W-40, the service manager said they need to top off the engine using 5W-30 synthetic blend as per Hyundai Corporate. Will adding .2 quarts (189ml) of 5W-30 synth blend cause any issues? I'm 1000 miles into my OCI, don't want to dump the oil unless I really need to.

For the record my engine has never consumed 0W-40 of 5W-40 which is why I use those grades. I didn't have the same luck with 5W-30 which required top off after 2-3 months. I suspect the turbo variant engines like higher weight oils, but maybe that's only true for my engine.

Either way, the only reason why I took my car to get checked out, is to keep the warranty intact. Which is now extended to 120k miles due to potential engine issues.

https://hyundai.oemdtc.com/Recall/162/RCMN-17V226-4739.pdf

Thanks,
Swift
_________________________
2013 Hyundai Sonata 2.0T SE
M1 0W-40 : Fram XG9688
4k OCI


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#4596999 - 12/07/17 10:11 AM Re: Mixing grades [Re: Swift101]
ammolab Offline


Registered: 01/16/06
Posts: 996
Loc: Ruidoso, NM USA
No issue at all with the "mix" and another .2 guards of oil will not fix anything.
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#4597001 - 12/07/17 10:14 AM Re: Mixing grades [Re: Swift101]
wemay Offline


Registered: 04/04/12
Posts: 8896
Loc: Southeast Florida
None at all.
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2017 Hyundai Sonata Sport 2.4L
2013 Hyundai Santa Fe Sport 2.0T
Valvoline

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#4597019 - 12/07/17 10:31 AM Re: Mixing grades [Re: Swift101]
Miller88 Offline


Registered: 04/09/08
Posts: 12704
Loc: Onondaga County
How does adding .2 quart of oil help stop the engine from blowing up?
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#4597028 - 12/07/17 10:47 AM Re: Mixing grades [Re: Miller88]
Linctex Offline


Registered: 12/31/16
Posts: 6160
Loc: Waco, TX
Originally Posted By: Miller88
How does adding .2 quart of oil help stop the engine from blowing up?


That's the million dollar question....
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"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4597036 - 12/07/17 10:59 AM Re: Mixing grades [Re: Swift101]
JMJNet Offline


Registered: 09/06/07
Posts: 934
Loc: TX, USA
It gives a little bit more to compensate of oil burning.

No, adding other grade will not cause your engine to blow up either.
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#4597039 - 12/07/17 11:08 AM Re: Mixing grades [Re: Swift101]
Zaedock Offline


Registered: 09/10/05
Posts: 3940
Loc: Massachusetts
Adding .2 quart, or even 2 quarts, wouldn't do anything for the oil pressure.
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2016 KIA Optima SXL 2.0L Turbo/2012 F150 Ex-cab 5.0L
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#4597045 - 12/07/17 11:18 AM Re: Mixing grades [Re: Swift101]
MONKEYMAN Offline


Registered: 06/24/04
Posts: 2231
Loc: St. Louis
If you think about it, you probably have .2 quarts remaining after each oil change and the new oil will mix with it.

Your experience is one reason I do not trust Hyundai and trying to be careful what oil I use in my Elantra.
_________________________
Truth alone triumphs, not untruth.

2017 Elantra SE

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#4597051 - 12/07/17 11:22 AM Re: Mixing grades [Re: Swift101]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11970
Loc: N.H, U.S.A.
Initially Sounds like a bunch of pseudo science. They didn't need to add .2qts! There is a safe oil RANGE and all cars will operate w/in that range. not all cars are moving around topped up - ex maybe HERE! smile

But with a chain motor, at a lower warmup viscosity, if the oil management is not correct the chain can pump oil out of the sump at certain higher RPM possibly leave it dry esp going up a mopderate grade. I know I do this every day in the winter - I have to climb a 25% grade with a cold engine at 3000rpm.

Is this rear pickup or front pickup?
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#4597115 - 12/07/17 12:52 PM Re: Mixing grades [Re: Swift101]
redbone3 Offline


Registered: 06/09/12
Posts: 658
Loc: Reno, NV
The dealer added the oil that the manufacturer recommends, on their dime. Nothing noteworthy. However, I don't see how an additional .2 quarts of oil is going to remedy anything.


Edited by redbone3 (12/07/17 12:53 PM)
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2014 Passat Wolfsburg, 1995 Miata.

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#4597159 - 12/07/17 01:40 PM Re: Mixing grades [Re: redbone3]
Dallas69 Offline


Registered: 02/11/14
Posts: 1664
Loc: Texas
.2 qts isn't going to fix anything.
They have to be doing something else to fix whatever problem exists.
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#4597172 - 12/07/17 01:53 PM Re: Mixing grades [Re: MONKEYMAN]
djb Offline


Registered: 01/16/06
Posts: 725
Loc: Los Gatos CA
Originally Posted By: MONKEYMAN
If you think about it, you probably have .2 quarts remaining after each oil change and the new oil will mix with it.


It could be more than a quart remaining during an oil change, even for a small engine.

I recently rebuilt a BMW M54 I6 engine that took at least 1.5 quarts more for the first fill than it does for an oil change. A good part of that goes into the hydraulic system it uses to adjust valve timing, but there was plenty that drained out of the oil pump, pressure regulator and oil passages.

Remember that when waiting for the last few drops to drain from the oil pan -- the only reason to do so is to minimize the mess.

In this case the shorter dipstick might have also reduced the capacity between the full and empty marks. Perhaps a steep incline with a minimum fill resulted in a chain or timing gear no longer dipping into the oil, or even the oil pick-up tube sucking in air.

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#4597216 - 12/07/17 02:45 PM Re: Mixing grades [Re: Swift101]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
.2 quarts "fixes" an issue worthy of a recall? Vewwwy intewesting.


Edited by Alex_V (12/07/17 02:45 PM)
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#4597254 - 12/07/17 03:30 PM Re: Mixing grades [Re: Swift101]
Throt Offline


Registered: 11/15/14
Posts: 906
Loc: Jacksonville, FL
What I love about the link is how very specific they were on whether to use Conventional or Synthetic. If the engine passes throw Dino in it, if it fails and gets a new engine then use synthetic.

We know that synthetic is superior in nearly every way. I don't understand why OEM's don't start requiring it in the Owner's Manual.


Edited by Throt (12/07/17 03:31 PM)
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'18 Cadillac ATS AWD, 2.0L T-GDI, 3500, Factory Fill/Filter, his (lease)
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#4597257 - 12/07/17 03:35 PM Re: Mixing grades [Re: ARCOgraphite]
Linctex Offline


Registered: 12/31/16
Posts: 6160
Loc: Waco, TX
Originally Posted By: ARCOgraphite

But with a chain motor, at a lower warmup viscosity, if the oil management is not correct the chain can pump oil out of the sump


On MOST (if not all?) chain-driven cam engines, the bottom sprocket does NOT dip low enough to reach engine oil level.
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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