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Actual damage from fuel dilution? #5137616 06/18/19 01:58 PM
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Deontologist Offline OP
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Are there any actual reports of damage from fuel dilution? All I can find is people taking precautionary measures. Has fuel dilution actually resulted in a broken engine, especially for DI Honda's? Seems like there's not any actual stories of damaged Honda's, which makes me think the engineers accounted for fuel dilution.

Re: Actual damage from fuel dilution? [Re: Deontologist] #5137622 06/18/19 02:04 PM
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Pelican Offline
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There were some, but taken care of under warranty, if memory serves. I seem to recall that Honda xtended the warranty for some cars, but am not certain.

Re: Actual damage from fuel dilution? [Re: Deontologist] #5137624 06/18/19 02:05 PM
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rooflessVW Offline
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If fuel dilution kills an engine, it will be a slow death.


"Zed's dead baby, Zed's dead."
Re: Actual damage from fuel dilution? [Re: rooflessVW] #5137637 06/18/19 02:16 PM
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dave1251 Offline
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Originally Posted by rooflessVW
If fuel dilution kills an engine, it will be a slow death.



Much like age.


make the inside of your engine oil cap white.
don't use.
Re: Actual damage from fuel dilution? [Re: dave1251] #5137643 06/18/19 02:23 PM
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rooflessVW Offline
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Originally Posted by dave1251
Originally Posted by rooflessVW
If fuel dilution kills an engine, it will be a slow death.
Much like age.

Well, call it an accelerated death. Like smoking a pack a day.

It will shorten your life, and may cause a catastrophic failure.


"Zed's dead baby, Zed's dead."
Re: Actual damage from fuel dilution? [Re: Deontologist] #5137672 06/18/19 02:53 PM
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talest Offline
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It will also give the inside of your engine a good cleaning before you get that fuel diluted oil out of it.

Do something like fill the crankcase up with diesel fuel or kerosene, and it attacks every oil seal in your engine. Too much for too long, you may have problems where you did not before. Replace all oil with diesel or kerosene and let it idle a half hour as some say is probably the maximum aggressive tactic to clean out an old engine, then refill with oil, but did you damage the engine? Only if you damaged those seals.

Re: Actual damage from fuel dilution? [Re: Deontologist] #5137676 06/18/19 02:56 PM
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According to Honda, damage from fuel dilution in the GDI engine is "a real thing":

https://www.wardsauto.com/engines/h...mp;elq2=31a505e3bfbd482e808a9f825fb38c41

Take a good look at that picture! I hope what was for effect and NOT as a result of the issue for them.

I think the issue is poor lubrication as the oil gets loaded up with gasoline byproducts to the point of greatly accelerated bearing/piston ring wear that eventually results in significant engine damage.
Honda has apparently had several "updates" to attempt to address it for their 1.5L engine. Don't know how effective that has really been as I don't own one.

Last edited by WhizkidTN; 06/18/19 03:01 PM.

His: '12 Kia Optima SX - 2.0L GDI Twin-Scroll Turbo [Tuned] (85K)
>EDGE 0W-40, Fram XG9688
Her's: '14 Nissan Rogue SL AWD - 2.5L NA (94K)
>EDGE 0W-20, Fram XG6607/XG7317
Re: Actual damage from fuel dilution? [Re: Deontologist] #5137691 06/18/19 03:16 PM
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ChrisD46 Offline
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Shorter OCI's with DI engines and following the severe schedule with DI "short trippers" will help protect you from the affects of fuel dilution .


'17 Hyundai Sonata 2.4L GDI 5W20 QSUD / Fram Ultra #9688
'10 Hyundai Elantra 2.0L 5W30 (50%) / 5W20 (50%) QSUD / Fram Ultra #9688
'07 Kia Sedona 3.8L 5W30 Castrol EP / Fram Ultra #9999
Re: Actual damage from fuel dilution? [Re: WhizkidTN] #5137714 06/18/19 03:52 PM
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Imp4 Online Content
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Originally Posted by WhizkidTN
According to Honda, damage from fuel dilution in the GDI engine is "a real thing":

...
I think the issue is poor lubrication as the oil gets loaded up with gasoline byproducts to the point of greatly accelerated bearing/piston ring wear that eventually results in significant engine damage.
Honda has apparently had several "updates" to attempt to address it for their 1.5L engine. Don't know how effective that has really been as I don't own one.


Well here's what Honda thinks, taken straight from your linked article

Quote
Honda spokesman Chris Martin says abnormal oil dilution remains “extremely rare, especially outside of extremely cold weather areas.” The problem occurs when unburned fuel slips past piston rings and mixes with engine oil in the crankcase.


So if you're a member of the Saskatchewan short trippers club, you might be in trouble.

All others need not apply. Especially anyone who drives a vehicle that gets up to operating temperature on a semi-consistent basis.


2001 Mitsubishi Galant 2.4 - 165k+
Grandma's creampuff...
Re: Actual damage from fuel dilution? [Re: Deontologist] #5137718 06/18/19 03:57 PM
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PimTac Offline
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We have had a good number of UOAs posted here with high fuel dilution numbers yet wear metals were still low.


2017 Mazda CX5
Havoline Pro DS 0w20
Roki OEM filter.
Re: Actual damage from fuel dilution? [Re: PimTac] #5137721 06/18/19 04:01 PM
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spasm3 Offline
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Originally Posted by PimTac
We have had a good number of UOAs posted here with high fuel dilution numbers yet wear metals were still low.



True, but UOA's are more of a measure of how the oil is holding up, not the engine. I think there was a BMW model a while back that was known for eating main bearings and it did not always show on uoas.

Last edited by spasm3; 06/18/19 04:16 PM.

13 elantra 78k 5w30 synpwr
03 chevy avalanche 83k synpwr 5w30
17 mazda cx-5 16400 miles m1 0w40
Re: Actual damage from fuel dilution? [Re: rooflessVW] #5137743 06/18/19 04:49 PM
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Originally Posted by rooflessVW
Originally Posted by dave1251
Originally Posted by rooflessVW
If fuel dilution kills an engine, it will be a slow death.
Much like age.

Well, call it an accelerated death. Like smoking a pack a day.

It will shorten your life, and may cause a catastrophic failure.



Unlike smoking fuel dilution is not the reason most cars are retired. The majority of cars are still discarded rather then sent to the junkyard because of failure.


make the inside of your engine oil cap white.
don't use.
Re: Actual damage from fuel dilution? [Re: Deontologist] #5137746 06/18/19 04:58 PM
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The damage happens over time and ultimately reduces the engines life expectancy before major repairs are needed. A high fuel dilution % [can] be a sign of other problems like worn rings, leaky fuel injectors or incomplete combustion.

Re: Actual damage from fuel dilution? [Re: PimTac] #5137753 06/18/19 05:07 PM
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demarpaint Offline
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Originally Posted by PimTac
We have had a good number of UOAs posted here with high fuel dilution numbers yet wear metals were still low.

We had a member a few years back with perfect UOAs and a blown engine. A UOA is a good tool, with limited purposes.

Fuel dilution as others stated can take its toll on an engine. How soon, or how much fuel is up for debate, but it can shorten the life of an engine.


God Bless Our Troops

Re: Actual damage from fuel dilution? [Re: PimTac] #5137872 06/18/19 07:22 PM
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Talent_Keyhole Offline
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Originally Posted by PimTac
We have had a good number of UOAs posted here with high fuel dilution numbers yet wear metals were still low.


BlackStone provided 568 results for GMs 2.4l Ecotec engine from 2006 - 2017, used in a dozen different vehicles. GDI version of the same engine had twice the iron wear rate, elevated chromium levels when compared with the same engine that had port fuel injection. In those engines that were above 3 percent resulted in 3x the wear rate. Extremely high fuel dilution, copper, aluminum, lead were also elevated indicating damage to bearing material. Looking at individual UOAs will not show this trend.

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