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What Makes Fuel Dilution So Harmful? #5422948 05/06/20 07:28 PM
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Hyperscn64 Offline OP
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Since I am a 90% big city, stop and go driver who puts 8,000 miles or so per year, I know I am "severe service". I know that this can lead to fuel dilution. But what, exactly, does that do to the engine? Is synthetic oil better at preventing this? I posted here before and managed to have my neighbor change my oil with Valvoline 5 30 Max life Semi-Synthetic.


"2006 Toyota Corolla, 76,000 miles.."

Re: What Makes Fuel Dilution So Harmful? [Re: Hyperscn64] #5422977 05/06/20 07:47 PM
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CT8 Online Content
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The oil becomes diluted.


2015 F150 2.7
2018 F350 6.2
Re: What Makes Fuel Dilution So Harmful? [Re: Hyperscn64] #5422980 05/06/20 07:49 PM
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HangFire Offline
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Gasoline is a poor lubricant.


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Re: What Makes Fuel Dilution So Harmful? [Re: CT8] #5422984 05/06/20 07:54 PM
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Lolvoguy Offline
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Originally Posted by CT8
The oil becomes diluted.

AND this prevents the oil from doing it's job of lubricating leading to accelerated engine wear.

Happened on my dad's old Volvo 245 withe the factory SU carb.
Nobody in town could tune it properly, so it needed an engine rebuilt far sooner than the previous Volvo's with FI


06 Lexus IS350- Wife
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Re: What Makes Fuel Dilution So Harmful? [Re: Hyperscn64] #5423008 05/06/20 08:09 PM
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OilUzer Offline
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in general, any kind of dilution is bad.
dilution definition:
"the action of making something weaker in force, content, or value."

good question. iirc syn can handle dilution better.

assuming that syn is stronger than dino ... some members may disagree grin2
therefore, based on the above definition, it will be harder to make a stronger oil weaker.

Re: What Makes Fuel Dilution So Harmful? [Re: Hyperscn64] #5423017 05/06/20 08:19 PM
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2015_PSD Offline
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I would also assume that fuel dilution (gasoline) reduces TBN because it accelerates acid production in the oil. The combination of reduced viscosity and potential reduced TBN lowers overall life of the oil.


2019 o)|||||(o Rubicon Wrangler Unlimited 3.6L V6 [Castrol Edge + Ultra]
2018 Mercedes Benz C300 2.0L Turbo [Pennzoil Platinum + Mann filter]
Re: What Makes Fuel Dilution So Harmful? [Re: Hyperscn64] #5423020 05/06/20 08:22 PM
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double vanos Offline
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Despite fuel dilution being bad, how many UOAs do we have here with it yet the numbers are good? Quite a few actually.


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Re: What Makes Fuel Dilution So Harmful? [Re: Hyperscn64] #5423028 05/06/20 08:42 PM
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Reddy45 Offline
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OP if you want to keep the same driving habits but reduce dilution, drive in sport mode or whatever is the opposite of economy mode. Higher revs will warm up the engine quicker which helps dilution.

Re: What Makes Fuel Dilution So Harmful? [Re: Hyperscn64] #5423029 05/06/20 08:43 PM
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Hyperscn64 Offline OP
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I am a novice here. Thank you for that answers.

Re: What Makes Fuel Dilution So Harmful? [Re: Reddy45] #5423030 05/06/20 08:43 PM
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Hyperscn64 Offline OP
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Originally Posted by Reddy45
OP if you want to keep the same driving habits but reduce dilution, drive in sport mode or whatever is the opposite of economy mode. Higher revs will warm up the engine quicker which helps dilution.


Thank you. I will try.

Re: What Makes Fuel Dilution So Harmful? [Re: double vanos] #5423042 05/06/20 08:58 PM
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Originally Posted by double vanos
Despite fuel dilution being bad, how many UOAs do we have here with it yet the numbers are good? Quite a few actually.

Likely because the amount of dilution seen in modern DI vehicles isn't enough to cause any issues.


make the inside of your engine oil cap white.
don't use.
Re: What Makes Fuel Dilution So Harmful? [Re: Hyperscn64] #5423071 05/06/20 09:40 PM
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Eddie Offline
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+1 as dave1251 alluded to. Only when dilution get to ~> 3-4% do we see any meaningful wear increase. Ed


2014 CX5 Touring 2.5L :-)
Re: What Makes Fuel Dilution So Harmful? [Re: Hyperscn64] #5423176 05/07/20 05:37 AM
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Danno Offline
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If it was my car, I would change the oil more frequently with a less expensive Dino oil vs using a more expensive synthetic and longer oil change interval.
More frequent oci is a defense to fuel dilution.


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Re: What Makes Fuel Dilution So Harmful? [Re: Danno] #5423181 05/07/20 05:49 AM
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4WD Offline
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In my Baldwin filter thread you will see I only changed the filter but not the oil … and elected to top up with a quart of HD30 to offset potential dilution. So with 7/8 of the M1 0w20 having 5k … you could see dipstick hash marks through the oil.
(have an excess of 5 year old filters from 3 vehicles on same filter).

Re: What Makes Fuel Dilution So Harmful? [Re: Hyperscn64] #5423198 05/07/20 06:49 AM
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BMWTurboDzl Offline
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"Some" fuel isn't anything to worry about especially if it occurs in a vehicle which has been short tripped in the winter and/or has a lot of miles on it. In fact it is expected based upon the operating conditions. Engine design and wear rates have a large impact on fuel dilution. Leaking injectors are another.

Oil itself won't stop fuel dilution.

I don't think your 2006 Corolla is a known diluter.


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