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Oil for a Direct Injection engine? #2780756
10/23/12 12:43 AM
10/23/12 12:43 AM
Joined: Oct 2012
Posts: 8
Ohio
TheOtherGoose Offline OP
TheOtherGoose  Offline OP
Joined: Oct 2012
Posts: 8
Ohio
Hi everybody.

I have a new Hyundai direct injection (GDI) engine and am curious about oil as it relates to this type of engine.

Does the type of oil (synthetic vs conventional) have any effect on the amount of soot produced by the exhaust on a direct injection engine? Also, does the oil type (again, synthetic vs conventional) effect the rate of carbon buildup on the intake valves on this engine type?

Thanks for your insights on this subject.

Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780759
10/23/12 01:06 AM
10/23/12 01:06 AM
Joined: Nov 2010
Posts: 9,783
Saskatoon canada
Clevy Offline
Clevy  Offline
Joined: Nov 2010
Posts: 9,783
Saskatoon canada
Direct injection seems to dilute the oil with fuel pretty quickly so it's prudent to follow the manufacturers recommendations.
As far as soot I dont think it's an issue, and since the fuel is injected directly into the cylinder the intake valves never come in contact with any fuel,and the exhaust valves would behave similar to any other engine.


2006 Charger RT
Miles x 2 per oil filter
Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780782
10/23/12 03:39 AM
10/23/12 03:39 AM
Joined: Apr 2011
Posts: 1,259
Cadyville, NY
salv Offline
salv  Offline
Joined: Apr 2011
Posts: 1,259
Cadyville, NY
No specific oil recommendation, but Hyundai is now calling for a fuel system cleaner at every service interval.


2003 Trailblazer: Mobil Super HM 5w30 L25288
2000 Ford Focus Wagon: Mobil Super 5000 DW-5230
Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780814
10/23/12 05:12 AM
10/23/12 05:12 AM
Joined: Oct 2011
Posts: 434
East TN
LineArrayNut Offline
LineArrayNut  Offline
Joined: Oct 2011
Posts: 434
East TN
I have some experience with this. The only real answer is as good of a synthetic as your wallet can afford and short change intervals. It sounds like you have a normally aspirated version, yes? So it's not really bad at 7500 miles. Hyundai is telling you on a turbo that it beats up the oil quick by a max of 4800 miles. Even quite good oils are toast at 4800 in my car. It qualifies as severe which Hyundai says 3K miles, but even I can't do much of that, lol! I've only gotten to 4600 before it grosses me out to see how black it is and how fragrant with fuel it is. They back door the synthetic requirement by saying for added performance use 5w40. There is some evidence that low saps and low volatility are ways to better your talking points.

Last edited by LineArrayNut; 10/23/12 05:15 AM.

'11 Sonata SE 2.0T 2RT6 RL0W30 M1MX4T,0W40 LGBT Microgreen
'03 Honda SuperHawk VTR1000 M115W50 ST
'94 Jeep GC 5.2L GET5W30 Kreen XG
'84 S10 V8 M1HM M1
Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780848
10/23/12 06:36 AM
10/23/12 06:36 AM
Joined: Feb 2004
Posts: 428
Ft Hood Texas area
rossn2 Offline
rossn2  Offline
Joined: Feb 2004
Posts: 428
Ft Hood Texas area
I got a 2011 Hyundai Elantra and use Motorcraft 5w-20, OEM filter, and change every 5k miles (just cause it's easier for me to remember). Oil never smells like gas when it comes out. We have had no issues with the car and got 32k on it now...:)


2017 Ram 1500 Crewcab, Custom Ordered 4x4, 3.92 rear, Hemi
2018 Hyundai Sante Fe Sport 30mpg
2017 RG Ultra, 2009 Dyna Superglide
Re: Oil for a Direct Injection engine? [Re: rossn2] #2780850
10/23/12 06:43 AM
10/23/12 06:43 AM
Joined: Jun 2006
Posts: 5,226
KC
badtlc Offline
badtlc  Offline
Joined: Jun 2006
Posts: 5,226
KC
Originally Posted By: rossn2
I got a 2011 Hyundai Elantra and use Motorcraft 5w-20, OEM filter, and change every 5k miles (just cause it's easier for me to remember). Oil never smells like gas when it comes out. We have had no issues with the car and got 32k on it now...:)


That isn't a GDI engine.


2007 Ford Escape XLS 2.3L ATX, M1 AFE 0W20, Fram TG, 167k
2015 Chrysler T&C, 80k+, M1 AFE 0W20, Fram TG OF
2018 Forester Premium
Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780852
10/23/12 06:46 AM
10/23/12 06:46 AM
Joined: Dec 2003
Posts: 9,929
Florida, Cape Coral
Eddie Online sleepy
Eddie  Online Sleepy
Joined: Dec 2003
Posts: 9,929
Florida, Cape Coral
I drive a 2007 Mazda CX7 DI turbo engine vehicle and change oil at 6,000 mile intervals. I have 3 UOAs over the 60,000+ miles driven that demonstrate that even with ~ 1% fuel in the oil, that wear levels are very good. I also had concerns about intake valve cleaning but, to date I have has no issues. I think modern DI engines have much less problems with intake valve issues and probably fuel dilution issues also. Sometimes we just need to find something to worry about when there is nother there? Ed


CX5 Touring 2.5L :-)
Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780888
10/23/12 07:37 AM
10/23/12 07:37 AM
Joined: May 2008
Posts: 6,298
Easton, PA
lexus114 Offline
lexus114  Offline
Joined: May 2008
Posts: 6,298
Easton, PA
VWB has gotten some good uoa`s on a GM direct injection motor.


2017 Mercedes-Benz C300 4matic coupe 2.0 turbo
2016 Lexus RX 350 Autumn Shimmer AWD
Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780900
10/23/12 07:57 AM
10/23/12 07:57 AM
Joined: Oct 2012
Posts: 8
Ohio
TheOtherGoose Offline OP
TheOtherGoose  Offline OP
Joined: Oct 2012
Posts: 8
Ohio
Thanks for your replies. The 1.6L naturally-aspirated GDI engine is a pretty impressive effort by Hyundai.

It's not really a big deal overall, but the soot accumulates very quickly and it's tough to keep the rear bumper clean. Having white paint doesn't help, either. I wish direct injection engines weren't set to run so rich, but I guess that's the nature of the technology. I recently owned a Mazdaspeed 3 that also ran rich; add the turbo to the mix and that car was very tough on oil.

Am I correct in assuming that synthetic oil is less likely to crud-up (sorry for being so technical) the intake valves on a direct injection engine? I know this has been asked a million times, but I assume it's okay to switch to synthetic at the first oil change? I'm planning on doing the first change at 1,000 miles or so.

Last edited by TheOtherGoose; 10/23/12 07:59 AM.
Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780904
10/23/12 08:03 AM
10/23/12 08:03 AM
Joined: Nov 2009
Posts: 2,417
Oconomowoc Wi
Boss302fan Offline
Boss302fan  Offline
Joined: Nov 2009
Posts: 2,417
Oconomowoc Wi
PP 5W30.... Runs great in my sons 2011 Sonata...


John P
Wisconsin
2018 Subaru Outback 3.6R Limited
2006 GS 430
2006 Lexus LS 430
1990 Jaguar XJS V12
2011 Hyundai Santa Fe V6
Other fun cars
Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780910
10/23/12 08:16 AM
10/23/12 08:16 AM
Joined: Sep 2012
Posts: 125
Chicago IL USA
KlooksKleek Offline
KlooksKleek  Offline
Joined: Sep 2012
Posts: 125
Chicago IL USA
I did a UOA on my '11 Sonata with the 2.4 DI engine, M1 5w-30 with 5,500 miles on the oil. Came back with no trace of fuel. That was the first oil after the FF came out. I have since been using M1 5W-30 EP and now go 7.5K. Although I've not done another UOA, I do my own oil changes and have never detected any odor of fuel, even when some used oil has gotten on my hands.

I don't use a fuel system cleaner, but I do use a Top Tier fuel, which my owner's manual mentions. I think that's what Hyundai recommends: Top Tier fuel or the additive.


Klooks
2011 Hyundai Sonata Limited
2.4L DI
Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780915
10/23/12 08:22 AM
10/23/12 08:22 AM
Joined: Oct 2010
Posts: 1,829
.
Danh Offline
Danh  Offline
Joined: Oct 2010
Posts: 1,829
.
Manufacturers may have a much better handle on the intake valve deposit issue now, but to be on the safe side I'd suggest choosing an oil with low volatility to reduce the amount of offending vapors sucked into the PCV system.

Noack volatility seems to be pretty much in the same range for oils generally available in the US with 2 exceptions: Amsoil Signature Series and Pennzoil Ultra. Both of these are fine oils and have substantially lower volatility than other choices, but Ultra is cheaper and likely available at your local Wal-Mart

I have a 2012 Ford Focus with a DI engine and have chosen Ultra. 13,000 miles and no oil-related failures yet, so it must be working!

Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780975
10/23/12 09:14 AM
10/23/12 09:14 AM
Joined: Oct 2012
Posts: 8
Ohio
TheOtherGoose Offline OP
TheOtherGoose  Offline OP
Joined: Oct 2012
Posts: 8
Ohio
I'm certainly hoping that manufacturers are getting better at dealing with valve deposit issues. There's some scary stuff out there regarding Audi buildup issues, etc (although I assume this is getting to be fairly old now).

I've used the Hyundai/Kia recommended Techron additive recently on another 1.6L GDI that I have (my wife's 1.6L GDI is six months old).

I'm thinking that if the Techron every six months + nice synthetic @ 3K intervals doesn't keep these engines clean, there's something wrong.

I'll look into the Ultra since Pennzoil seems to be pushing the cleaning aspect of their oils more than their competitors. It certainly looks like changing to synthetic can be done at any time with no need to accumulate miles before the switch - if this assumption is wrong please let me know!

Thanks for your help on this, guys.

Last edited by TheOtherGoose; 10/23/12 09:15 AM.
Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780976
10/23/12 09:15 AM
10/23/12 09:15 AM
Joined: Sep 2006
Posts: 19,479
Chicago Area
mechtech2 Offline
mechtech2  Offline
Joined: Sep 2006
Posts: 19,479
Chicago Area
Exhaust will be the same - port or DI injection.
IF the DI system is programmed richer, you may get fuel dilution and maybe some more exhaust deposits. May USA cars are indeed unexplicably richer than Euoropean models, esp with turbos.

Intake valves will be dirtier with DI systems. It is their biggest problem as there is no fuel wash to clean them. Deposits come from oil down the valves, PCV system gunk, an overlap breathing. They intake valves also run hotter and any deposits are more apt to stay.

Re: Oil for a Direct Injection engine? [Re: TheOtherGoose] #2780988
10/23/12 09:20 AM
10/23/12 09:20 AM
Joined: Oct 2012
Posts: 8
Ohio
TheOtherGoose Offline OP
TheOtherGoose  Offline OP
Joined: Oct 2012
Posts: 8
Ohio
I agree regarding intake vs exhaust cleanliness on direct injection engines. I also scratch my head regarding the rich mixture on DI engines, but there must be some logic to it (I assume for durability).

I've even considered doing a yearly SeaFoam through the vacuum line... but this is for future obsessing.

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