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#4548618 - 10/19/17 07:38 PM Are we taking a step backwards with D.I. Engines?
5AcresAndAFool Offline


Registered: 12/18/16
Posts: 417
Loc: Indiana
We haven't seen a whole lot of issues with fuel dilution since the carburetor days until recently. These Engines with direct injection seem to have alot of issues, enough that its to the point I think i would avoid buying one if possible.

I hate to sound like "that guy", but can these direct injection engines get 300k plus on them with no issues like many recent gasoline engines?

Now I know I am painting a broad stroke here, I am sure some are more problematic than others, but they all seem hard on their oil to an extent, and many have fuel dilution issues.

Am I just being stubborn?

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#4548621 - 10/19/17 07:42 PM Re: Are we taking a step backwards with D.I. Engines? [Re: 5AcresAndAFool]
JHZR2 Offline



Registered: 12/14/02
Posts: 41758
Loc: New Jersey
What if, just what if, oils were improved to better accommodate the dilution, while engine controls were better optimized to reduce it?

How many vehicles have you recently taken to 300k without the car rotting out around the engine?

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#4548625 - 10/19/17 07:46 PM Re: Are we taking a step backwards with D.I. Engines? [Re: 5AcresAndAFool]
spasm3 Offline


Registered: 05/30/10
Posts: 8641
Loc: North Carolina
Originally Posted By: 5AcresAndAFool
We haven't seen a whole lot of issues with fuel dilution since the carburetor days until recently. These Engines with direct injection seem to have alot of issues, enough that its to the point I think i would avoid buying one if possible.



So far i have avoided them. I bought the 13 elantra and one of the factors was that it is MPFI. Factored the same thing in when we bought the 17 elantra with my son.

I think DI will get better over time. My next vehicle will probably be DI, but I'm putting it off as long as possible so the technology can mature.


Edited by spasm3 (10/19/17 07:46 PM)
_________________________
13 elantra 68k 5w30 QSUD
03 chevy avalanche76k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 3900 miles m1 0w20/0w40 mix

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#4548626 - 10/19/17 07:46 PM Re: Are we taking a step backwards with D.I. Engines? [Re: 5AcresAndAFool]
JohnnyJohnson Online   content


Registered: 10/22/09
Posts: 2731
Loc: Wet side WA
Originally Posted By: 5AcresAndAFool
We haven't seen a whole lot of issues with fuel dilution since the carburetor days until recently. These Engines with direct injection seem to have alot of issues, enough that its to the point I think i would avoid buying one if possible.

I hate to sound like "that guy", but can these direct injection engines get 300k plus on them with no issues like many recent gasoline engines?

Now I know I am painting a broad stroke here, I am sure some are more problematic than others, but they all seem hard on their oil to an extent, and many have fuel dilution issues.

Am I just being stubborn?


No 20K plus is a lot of money to be spending on a potential car with an engine issue.

I'm going to see what this new high tech engine brings to Mazda if it even happens. But I have time to burn not money.



Edited by JohnnyJohnson (10/19/17 07:53 PM)
_________________________
2004 Toyota Corolla 121525
Out: QSUD 5W-30 Purolator One 5030
In: Valvoline ML 5w-30 TG4967 117530 2-8-18
2006 Duramax 74016
Out: T6 5W-40 M1-303
In: T6 5W-40 XG9100 73752 4-22-18

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#4548631 - 10/19/17 07:48 PM Re: Are we taking a step backwards with D.I. Engines? [Re: 5AcresAndAFool]
dave123 Offline


Registered: 01/13/09
Posts: 2313
Loc: wi
100k+ on my skyactiv DI Mazda3 runs like day I bought it not one single issue yet. Although I may be biased but I think they have best technology hands down.


Edited by dave123 (10/19/17 07:49 PM)

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#4548632 - 10/19/17 07:48 PM Re: Are we taking a step backwards with D.I. Engines? [Re: JHZR2]
5AcresAndAFool Offline


Registered: 12/18/16
Posts: 417
Loc: Indiana
Originally Posted By: JHZR2
What if, just what if, oils were improved to better accommodate the dilution, while engine controls were better optimized to reduce it?

How many vehicles have you recently taken to 300k without the car rotting out around the engine?


I wont run a car up to 300k at this point in my life, not many do.

I have a friend with an 07, with 370k on it.

I dont drive that much anymore, but I when I did I had a 4 year old car with almost 200k on it. My wife and I worked opposite shifts and we both commuted a distance using that car.

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#4548634 - 10/19/17 07:49 PM Re: Are we taking a step backwards with D.I. Engines? [Re: 5AcresAndAFool]
babyivan Offline


Registered: 07/31/09
Posts: 383
Loc: queens
I own a 2017 WRX and have not noticed any fuel/oil dilution. I do change my oil though no later than 2750 miles, which is less than half what Subaru recommends. I am more concerned about carbon build up, but I flog her regularly, so I don't think it will be too bad.
_________________________
17 WRX 6 speed

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#4548639 - 10/19/17 07:51 PM Re: Are we taking a step backwards with D.I. Engines? [Re: 5AcresAndAFool]
Brett776 Offline


Registered: 07/17/17
Posts: 25
Loc: Florida
I have no desire for direct injection, Iíll wait till itís more proven. I have a company car so the better mpg argument isnít good enough. I only drive my truck on the weekends.

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#4548642 - 10/19/17 07:53 PM Re: Are we taking a step backwards with D.I. Engines? [Re: 5AcresAndAFool]
philipp10 Offline


Registered: 05/09/14
Posts: 1171
Loc: Minnesota
Well I have had experience with one DI engine. A 2013 Honda Accord K24. I was following the OLM and at 9000K, at 10% life left, the oil looks and smelled just fine. The DI didn't seem to affect the oil in this car....and btw, not a drop was used.

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#4548645 - 10/19/17 07:55 PM Re: Are we taking a step backwards with D.I. Engines? [Re: 5AcresAndAFool]
dishdude Offline


Registered: 11/14/08
Posts: 8727
Loc: Phoenix
I've had a few DI cars now, no issues to report.
_________________________
2018 Challenger SRT

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#4548654 - 10/19/17 08:02 PM Re: Are we taking a step backwards with D.I. Engines? [Re: dishdude]
SatinSilver Offline


Registered: 01/24/08
Posts: 10128
Loc: OH
Originally Posted By: dishdude
I've had a few DI cars now, no issues to report.


Right but none of those cars you had very long.

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#4548656 - 10/19/17 08:05 PM Re: Are we taking a step backwards with D.I. Engines? [Re: 5AcresAndAFool]
OneEyeJack Offline


Registered: 09/14/10
Posts: 7471
Loc: S California
I thought GDI was just a hack to cool down the combustion chamber to meet smog regulations.

Other than that I wonder if we'd ever see GDI on a daily driver.

Back in the old days of carburetors and fuel dilution, it was taken care of with thicker oil and more frequent oil changes. It if was a problem it was averaged in with normal wear and tear and no one thought much of it.

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#4548662 - 10/19/17 08:14 PM Re: Are we taking a step backwards with D.I. Engines? [Re: 5AcresAndAFool]
JTK Offline


Registered: 08/14/03
Posts: 10559
Loc: Buffalo, NY
Is fuel dilution a thing for all DI gasoline engines? Makes me wonder if it's not a specific usage induced thing. What kind of scares me more is the high pressure fuel pump/sending units and associated components. I couldn't imagine what replacement cost is for a DI FSU.
_________________________
2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)

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#4548665 - 10/19/17 08:18 PM Re: Are we taking a step backwards with D.I. Engines? [Re: 5AcresAndAFool]
Wolf359 Offline


Registered: 04/27/12
Posts: 4739
Loc: MA
I'm not sure how it's a step backwards. It's supposed to give you better mpg and more power or pick one over the other. Mercedes went to DI in 2012 in their E class. Went from 268hp in the previous 3.5L engine to 302hp in their new engine and it got better gas mileage too. Went from 17 city/24 highway to 19 city/28 highway afterwards.

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#4548666 - 10/19/17 08:19 PM Re: Are we taking a step backwards with D.I. Engines? [Re: SatinSilver]
dishdude Offline


Registered: 11/14/08
Posts: 8727
Loc: Phoenix
Originally Posted By: SatinSilver
Originally Posted By: dishdude
I've had a few DI cars now, no issues to report.


Right but none of those cars you had very long.


5 cars, each run up to about 40k. No fuel dilution or other issues. I see no reason to be afraid of DI.
_________________________
2018 Challenger SRT

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