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Mixing grades #4596986
12/07/17 11:06 AM
12/07/17 11:06 AM
Joined: Nov 2013
Posts: 386
NYC
Swift101 Offline OP
Swift101  Offline OP

Joined: Nov 2013
Posts: 386
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

Re: Mixing grades [Re: Swift101] #4596999
12/07/17 11:11 AM
12/07/17 11:11 AM
Joined: Jan 2006
Posts: 1,105
Ruidoso, NM USA
ammolab Offline
ammolab  Offline

Joined: Jan 2006
Posts: 1,105
Ruidoso, NM USA
No issue at all with the "mix" and another .2 guards of oil will not fix anything.


2009 Honda CR-V
2011 BMW R1200R
2005 Kaw Ninja 250
1994 Jeep Wrangler 2.5L
2016 Chevy SS Sport Sedan
Re: Mixing grades [Re: Swift101] #4597001
12/07/17 11:14 AM
12/07/17 11:14 AM
Joined: Apr 2012
Posts: 10,470
Kendall, FL
wemay Offline
wemay  Offline

Joined: Apr 2012
Posts: 10,470
Kendall, FL
None at all.


18 KIA Sportage 2.4 AWD
PUP 5W30, OEM
QSUD 5W20, OEM (next)

13 Hyundai Santa Fe Sport 2.0T
MAGNATEC 5W30, OEM
PPEuroL 5W30, OEM (next)
Re: Mixing grades [Re: Swift101] #4597019
12/07/17 11:31 AM
12/07/17 11:31 AM
Joined: Apr 2008
Posts: 13,185
Central NY
Miller88 Offline
Miller88  Offline

Joined: Apr 2008
Posts: 13,185
Central NY
How does adding .2 quart of oil help stop the engine from blowing up?


18 Forester 2.5I 6M
00 Jeep XJ
01 F-350 4x4 5M
Re: Mixing grades [Re: Miller88] #4597028
12/07/17 11:47 AM
12/07/17 11:47 AM
Joined: Dec 2016
Posts: 7,991
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 7,991
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....


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Mixing grades [Re: Swift101] #4597036
12/07/17 11:59 AM
12/07/17 11:59 AM
Joined: Sep 2007
Posts: 1,123
TX, USA
JMJNet Offline
JMJNet  Offline

Joined: Sep 2007
Posts: 1,123
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.


  • 2017 Toyota Sienna
  • 1995 GMC Suburban 6.5L Turbo Diesel


Re: Mixing grades [Re: Swift101] #4597039
12/07/17 12:08 PM
12/07/17 12:08 PM
Joined: Sep 2005
Posts: 3,958
Massachusetts
Zaedock Offline
Zaedock  Offline

Joined: Sep 2005
Posts: 3,958
Massachusetts
Adding .2 quart, or even 2 quarts, wouldn't do anything for the oil pressure.


2019 Escape EB AWD/2016 KIA Optima SXL 2.0L Turbo/2012 F150 Ex-cab 5.0L
1992 YJ "The Heep"/2015 Chrysler 200 Limited
1975 Ford Bronco/1959 Willys CJ5/Tube Rock crawler
Re: Mixing grades [Re: Swift101] #4597045
12/07/17 12:18 PM
12/07/17 12:18 PM
Joined: Jun 2004
Posts: 2,596
St. Louis
MONKEYMAN Offline
MONKEYMAN  Offline

Joined: Jun 2004
Posts: 2,596
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
Re: Mixing grades [Re: Swift101] #4597051
12/07/17 12:22 PM
12/07/17 12:22 PM
Joined: May 2009
Posts: 12,447
N.H, U.S.A.
ARCOgraphite Online content
ARCOgraphite  Online Content

Joined: May 2009
Posts: 12,447
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?


2019 VW Jetta S,6M OCI#0 1136mi-Castrol Edge Prof? VW508+OE Filter; '17 Subaru Crosstrek CVT OC#6 43467mi-Valvoline Adv 0w20 + SOA Filter
Re: Mixing grades [Re: Swift101] #4597115
12/07/17 01:52 PM
12/07/17 01:52 PM
Joined: Jun 2012
Posts: 717
Reno, NV
redbone3 Offline
redbone3  Offline

Joined: Jun 2012
Posts: 717
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.

Last edited by redbone3; 12/07/17 01:53 PM.

2014 Passat Wolfsburg, 1995 Miata.
Re: Mixing grades [Re: redbone3] #4597159
12/07/17 02:40 PM
12/07/17 02:40 PM
Joined: Feb 2014
Posts: 1,840
Texas
Dallas69 Offline
Dallas69  Offline

Joined: Feb 2014
Posts: 1,840
Texas
.2 qts isn't going to fix anything.
They have to be doing something else to fix whatever problem exists.


2009 Galant-ultra oil and filter
1987 Ford F-150 302
Smittys 5-30
Motorcraft filter
Re: Mixing grades [Re: MONKEYMAN] #4597172
12/07/17 02:53 PM
12/07/17 02:53 PM
Joined: Jan 2006
Posts: 758
Los Gatos CA
djb Offline
djb  Offline

Joined: Jan 2006
Posts: 758
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.

Re: Mixing grades [Re: Swift101] #4597216
12/07/17 03:45 PM
12/07/17 03:45 PM
Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
Alex_V Offline
Alex_V  Offline

Joined: Apr 2016
Posts: 1,202
Campbellsville, KY
.2 quarts "fixes" an issue worthy of a recall? Vewwwy intewesting.

Last edited by Alex_V; 12/07/17 03:45 PM.

To quote a friend, "Synthetics, man."

'85 GMC C3500, 454, 132K
'82 Mercedes 300CD, OM617 turbo, 173K (totaled 2018, in rehab)
'85 Mercedes 300TD, OM617 turbo, 217K (wife's)
'67 Suburban, 350, 331K
Re: Mixing grades [Re: Swift101] #4597254
12/07/17 04:30 PM
12/07/17 04:30 PM
Joined: Nov 2014
Posts: 1,047
NE Florida
Throt Offline
Throt  Offline

Joined: Nov 2014
Posts: 1,047
NE Florida
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.

Last edited by Throt; 12/07/17 04:31 PM.

'18 Honda Accord Touring, 1.5T, 6,200, PPPP 5w30 w/ FU
'17 Elantra, 2.0L, 25,000, QS Ult. 0w20 w/ FU, hers (lease)
Re: Mixing grades [Re: ARCOgraphite] #4597257
12/07/17 04:35 PM
12/07/17 04:35 PM
Joined: Dec 2016
Posts: 7,991
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 7,991
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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