Fuel Dilution - Does conventional vs. synthetic make a difference?

getawheel

Site Donor 2021
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Gainesville, FL
This question popped in my head as I was trying to sleep...

Let's say you're trying to combat fuel dilution on a TGDI engine. Changing at relatively short intervals (5k/6mo.), would it be better to use cheap conventional OR do modern synthetics have some property which helps them better maintain their viscosity when diluted?

I'm sure there's a thousand different opinions on this, but I'm looking for actual data (or at least solid fact-based theory).
 

OVERKILL

$100 Site Donor 2021
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Ontario, Canada
Synthetic bases may degrade less in the presence of fuel but that's probably about it. In terms of viscosity loss, it should be the same between them.
 
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726
Location
EU
Intervals are less interesting than effective PCV, sufficient oil temperatures and so on.

Screenshot 2020-09-25 011811.jpg
 
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16,120
Location
NE,Ohio
Most TGDI engines spec a syn oil so the question is already answered.. also you need lspi mitigation so
just dropping in a 15w40 mixed fleet oil isnt the answer.

My jeep spec's jeep ms-13340, api sn+ if not available, and the OLM is upto 10k miles or so.. I usually change at 4000-5000. (40-50% oil life remaining)
although in the summer might stretch it out to 6k miles or so.
usually the winter oci is the shortest.

THE OLM isnt a generic miles type it takes into account driving conditions.. but I think its extremely optimistic. the 2.0T engine and the 3.2 pentastar basically get the same OLM.. from what I can tell from owning both.. they did spec different oils however.
 
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Eastern Wa.
I've ran both conventional and synthetic in an EcoBoost 2.0, oil always turns dark quickly and smells like fuel. I'm only running 4,000 mile intervals so I don't really think it matters much.
 
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9,105
Location
Houston, TX
I think DNewton shared something about this some time back and the bottom line is the only true "management" for fuel dilution is a shorter OCI; i.e. change the oil--no matter what the base stock may be.
 
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726
Location
EU
With just 1,3% of gasoline after 20,000 miles in my rotary I dare to say that short OCI as a cure would be more true for a diesel on FAME. Gasoline is sufficiently elusive.
 
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