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#4599227 - 12/09/17 05:44 PM Fuel Dilution - FAQ
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada


LOL


Edited by JHZR2 (12/11/17 07:37 AM)
Edit Reason: Censor bypass
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#4599371 - 12/09/17 08:30 PM Re: Fuel Dilution - FAQ [Re: StevieC]
Ducked Offline


Registered: 10/25/12
Posts: 4369
Loc: Taiwan
Goes on a bit.

(fuel dilution) "is why the service interval has a time limit as well as a mileage limit" (probably not an exact quote but close enough) doesn't appear to make sense.

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#4599386 - 12/09/17 08:56 PM Re: Fuel Dilution - FAQ [Re: StevieC]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Excessive idling / stop-go traffic. Low miles but high fuel dilution because of lots of injection cycles and/or low temps not heating the oil enough to evaporate some of the fuel.
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#4599393 - 12/09/17 09:14 PM Re: Fuel Dilution - FAQ [Re: StevieC]
Ducked Offline


Registered: 10/25/12
Posts: 4369
Loc: Taiwan
Originally Posted By: StevieC
Excessive idling / stop-go traffic. Low miles but high fuel dilution because of lots of injection cycles and/or low temps not heating the oil enough to evaporate some of the fuel.


I dunno. Are low miles necessarily, or even generally, slow miles?

I was thinking of my own situation, where the car is mostly recreational use so infrequent but gets up to temperature when it is used.

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#4599420 - 12/09/17 10:00 PM Re: Fuel Dilution - FAQ [Re: StevieC]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
It really depends on what temperature the oil reaches and for how long to help evaporate the contaminants. Then if it spends more time idling than actually moving then that is a factor as well as my first point. grin2
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#4599433 - 12/09/17 10:26 PM Re: Fuel Dilution - FAQ [Re: StevieC]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17783
Loc: PNW
That guy's a bit "snotty" ... LOL Guess he thinks that gets subscribers.

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#4599671 - 12/10/17 09:00 AM Re: Fuel Dilution - FAQ [Re: StevieC]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
He is cranky for sure.... grin2
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#4599711 - 12/10/17 09:35 AM Re: Fuel Dilution - FAQ [Re: StevieC]
4WD Online   confused


Registered: 09/21/10
Posts: 6398
Loc: Texas
I could not even finish ~ donít think Iíd send him a question and then sit and hear it mocked like a school boy Ö


Edited by 4WD (12/10/17 09:36 AM)

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#4599737 - 12/10/17 10:06 AM Re: Fuel Dilution - FAQ [Re: StevieC]
Eddie Offline


Registered: 12/07/03
Posts: 9569
Loc: Florida, Cape Coral
I would like to see some REAL data that plots % fuel vs wear. Based on 5 or so UOAs I've seen showing fuel dilution of 1 to 3% I've observed no real increase in wear. I think some of us get paranoid over the idea of fuel dilution. Ed
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#4599772 - 12/10/17 10:48 AM Re: Fuel Dilution - FAQ [Re: StevieC]
andyd Online   content


Registered: 09/25/04
Posts: 7156
Loc: Marshfield , MA
In the norm, from reading UOAs, fuel < 1%. Fuel dilution was a major deal with carbs and chokes. In a modern car, its a non-problem.
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#4599815 - 12/10/17 11:34 AM Re: Fuel Dilution - FAQ [Re: andyd]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Originally Posted By: andyd
In the norm, from reading UOAs, fuel < 1%. Fuel dilution was a major deal with carbs and chokes. In a modern car, its a non-problem.


I think lubricants have improved in this regard as well since then as well.


Edited by StevieC (12/10/17 11:34 AM)
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#4599855 - 12/10/17 12:46 PM Re: Fuel Dilution - FAQ [Re: andyd]
Danh Offline


Registered: 10/16/10
Posts: 1750
Loc: .
Originally Posted By: andyd
In the norm, from reading UOAs, fuel < 1%. Fuel dilution was a major deal with carbs and chokes. In a modern car, its a non-problem.


You're likely reading UOAs from Blackstone, which are not reliable for gauging fuel dilution. Look at Oil Analyzers/Polaris UOAs instead, which uses gas chromotography for this purpose. On Blackstone UOAs ignore fuel dilution and look at viscosity instead: you'll see lots of samples below or nearly below grade.

Fuel dilution is an issue withnDI/TGDI engines; the question is how harmful it is. But when you hear reports of increasing sump levels it can't be a non-problem.

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#4600202 - 12/10/17 08:11 PM Re: Fuel Dilution - FAQ [Re: Danh]
Balrog006 Offline


Registered: 08/09/16
Posts: 466
Loc: West Michigan
Originally Posted By: Danh
Originally Posted By: andyd
In the norm, from reading UOAs, fuel < 1%. Fuel dilution was a major deal with carbs and chokes. In a modern car, its a non-problem.


You're likely reading UOAs from Blackstone, which are not reliable for gauging fuel dilution. Look at Oil Analyzers/Polaris UOAs instead, which uses gas chromotography for this purpose. On Blackstone UOAs ignore fuel dilution and look at viscosity instead: you'll see lots of samples below or nearly below grade.

Fuel dilution is an issue withnDI/TGDI engines; the question is how harmful it is. But when you hear reports of increasing sump levels it can't be a non-problem.


Why not? Increasing to what level? Slight increases arenít any cause for concern-just like normal slight overfills arenít, but Iíve yet to see any pictures of major increases in overall sump volume reported here.
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