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#4586098 - 11/26/17 08:24 PM What does oil have to do with DI engines?
otis24 Offline


Registered: 10/30/05
Posts: 1656
Loc: 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?


Edited by otis24 (11/26/17 08:30 PM)
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#4586107 - 11/26/17 08:38 PM Re: What does oil have to do with DI engines? [Re: otis24]
AZjeff Online   content


Registered: 01/14/11
Posts: 2654
Loc: PV Az
Originally Posted By: otis24
What am I missing?


PCV
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#4586108 - 11/26/17 08:38 PM Re: What does oil have to do with DI engines? [Re: otis24]
Artem Online   content


Registered: 10/30/10
Posts: 5119
Loc: 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.
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#4586110 - 11/26/17 08:42 PM Re: What does oil have to do with DI engines? [Re: otis24]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35890
Loc: Great Lakes
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#4586134 - 11/26/17 09:09 PM Re: What does oil have to do with DI engines? [Re: otis24]
bigj_16 Offline


Registered: 07/03/17
Posts: 1271
Loc: Douglas County, Colorado
LSPI

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#4586141 - 11/26/17 09:15 PM Re: What does oil have to do with DI engines? [Re: otis24]
AZjeff Online   content


Registered: 01/14/11
Posts: 2654
Loc: PV Az
Low Speed Pre-Ignition is mainly a problem in turbo engines isn't it?
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#4586157 - 11/26/17 09:36 PM Re: What does oil have to do with DI engines? [Re: AZjeff]
Quattro Pete Offline


Registered: 10/30/02
Posts: 35890
Loc: 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.
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#4586177 - 11/26/17 10:05 PM Re: What does oil have to do with DI engines? [Re: otis24]
UncleDave Offline


Registered: 06/02/14
Posts: 1646
Loc: 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
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#4586283 - 11/27/17 05:43 AM Re: What does oil have to do with DI engines? [Re: Quattro Pete]
SilverSnake Offline


Registered: 05/29/13
Posts: 592
Loc: Florida
Originally Posted By: Quattro Pete
LSPI? Also...http://www.underhoodservice.com/oil-direct-fuel-injection/


Excellent article. Thank you.
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#4586285 - 11/27/17 05:48 AM Re: What does oil have to do with DI engines? [Re: otis24]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
LSPI, Fuel Dilution as I understand it.
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