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What does oil have to do with DI engines? #4586098
11/26/17 08:24 PM
11/26/17 08:24 PM
Joined: Oct 2005
Posts: 1,676
South Dakota
otis24 Offline OP
otis24  Offline OP
Joined: Oct 2005
Posts: 1,676
South Dakota
I was a salesman at a GM dealership when Direct Injection engines were coming on market and GM began the push for Dexos approved oils. I had also been a long time member of BITOG, so I was aware of reports of engine sludge and other problems with DI engines. I asked the GM trainer about this and his response is that that was why the Dexos oil requirements. Based on my rudimentary understanding of how engines work, what do oils have to do with Direct Injection? Oils do not enter the combustion chamber, at least not in sufficient quantity to provide a detergent effect. What am I missing?

Last edited by otis24; 11/26/17 08:30 PM.

1991 Chevrolet K1500 (4.3, 4x4, 86k miles)

2016 Dodge Grand Caravan
(3.6 V6) 46500 miles
Re: What does oil have to do with DI engines? [Re: otis24] #4586107
11/26/17 08:38 PM
11/26/17 08:38 PM
Joined: Jan 2011
Posts: 3,242
PV Az
AZjeff Offline
AZjeff  Offline
Joined: Jan 2011
Posts: 3,242
PV Az
Originally Posted By: otis24
What am I missing?


PCV


86 Samurai 1.3 leftovers
14 RAV4 2.5 5W-20 PP
16 Silverado 1500 4.3, DI, AFM 5W-30 PP

The most important thing to do in your life is to not interfere with someone else's life. - Frank Zappa

Re: What does oil have to do with DI engines? [Re: otis24] #4586108
11/26/17 08:38 PM
11/26/17 08:38 PM
Joined: Oct 2010
Posts: 5,410
Florida
Artem Offline
Artem  Offline
Joined: Oct 2010
Posts: 5,410
Florida
Well, Dexos oil can be formulated to withstand say, fuel dilution from Di engines better then oil B. That's about as far as the story goes.


2014 Mazda 3 Hatch 2.0L & 6spd - Idemitsu 0w20 Synthetic @ $0.75 a quart. (thanks Advance Auto Parts for the awesome deal)
Re: What does oil have to do with DI engines? [Re: otis24] #4586110
11/26/17 08:42 PM
11/26/17 08:42 PM
Joined: Oct 2002
Posts: 36,593
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,593
Great Lakes


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: What does oil have to do with DI engines? [Re: otis24] #4586134
11/26/17 09:09 PM
11/26/17 09:09 PM
Joined: Jul 2017
Posts: 1,292
Douglas County, Colorado
bigj_16 Offline
bigj_16  Offline
Joined: Jul 2017
Posts: 1,292
Douglas County, Colorado
LSPI

Re: What does oil have to do with DI engines? [Re: otis24] #4586141
11/26/17 09:15 PM
11/26/17 09:15 PM
Joined: Jan 2011
Posts: 3,242
PV Az
AZjeff Offline
AZjeff  Offline
Joined: Jan 2011
Posts: 3,242
PV Az
Low Speed Pre-Ignition is mainly a problem in turbo engines isn't it?


86 Samurai 1.3 leftovers
14 RAV4 2.5 5W-20 PP
16 Silverado 1500 4.3, DI, AFM 5W-30 PP

The most important thing to do in your life is to not interfere with someone else's life. - Frank Zappa

Re: What does oil have to do with DI engines? [Re: AZjeff] #4586157
11/26/17 09:36 PM
11/26/17 09:36 PM
Joined: Oct 2002
Posts: 36,593
Great Lakes
Quattro Pete Offline
Quattro Pete  Offline
Joined: Oct 2002
Posts: 36,593
Great Lakes
Originally Posted By: AZjeff
Low Speed Pre-Ignition is mainly a problem in turbo engines isn't it?

Yes, but a lot of GM's DI engines are turbocharged, so it applies to OP.


'02 530i (Edge 0W-40)
'15 Q5 3.0T (Edge 5W-40)
'18 Charger SRT (PUP 0W-40 SRT)
Re: What does oil have to do with DI engines? [Re: otis24] #4586177
11/26/17 10:05 PM
11/26/17 10:05 PM
Joined: Jun 2014
Posts: 1,942
Ca.
UncleDave Offline
UncleDave  Offline
Joined: Jun 2014
Posts: 1,942
Ca.
The part you are missing is that the (expensive) high pressure direct injection pump has a tremendous load on it - similar to a diesel HEUI type oil pressure driven pump.

This load is typically driven off a tertiary lobe on a cam.

This extreme pressure shears and is hard on oil.

UD


Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C
Re: What does oil have to do with DI engines? [Re: Quattro Pete] #4586283
11/27/17 05:43 AM
11/27/17 05:43 AM
Joined: May 2013
Posts: 681
Florida
SilverSnake Offline
SilverSnake  Offline
Joined: May 2013
Posts: 681
Florida
Originally Posted By: Quattro Pete
LSPI? Also...http://www.underhoodservice.com/oil-direct-fuel-injection/


Excellent article. Thank you.


2016 Charger, 6.4L-485 HP (PUP 0W-40)
2017 BMW 330i, 2L-248 HP (BMW 0W-20)
2018 Jeep GC, 5.7L-360 HP (PP 5W-20)
2008 20KW Generac (Amsoil 10W-30/30)
Re: What does oil have to do with DI engines? [Re: otis24] #4586285
11/27/17 05:48 AM
11/27/17 05:48 AM
Joined: Aug 2008
Posts: 21,175
ON, Canada eh?
StevieC Offline
StevieC  Offline
Joined: Aug 2008
Posts: 21,175
ON, Canada eh?
LSPI, Fuel Dilution as I understand it.


'18 Dodge Grand Caravan GT - AMSOIL SS 5w20
'06 Santa Fe - 535,000km AMSOIL SS 0w30 / ATF

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