How long/warm for GDI fuel dilution to burn off?

[dvancleve]

Howdy folks. I have a fairly new to me 2024 Hyundai Tucson PHEV. In the 2 1/2 months I’ve had it, the vast majority of miles have been EV. Before a recent round trip road trip to LA, I went almost 800 miles on just over a quarter tank of gas. Anyway, I was wondering how long an engine has to be at normal operating temp to evaporate any fuel out of the oil? I put over 600 miles of hybrid interstate driving on it with the temp “gauge” just below the midline most of that time. I assume that’s as warm as it gets under conditions

 

[iahawk]

I'll just say that 800 miles on a quarter tank of gas is freakin' impressive!

 

[oil pan 4]

An 85mph drive to Lubbock and back, about 90 miles each way seems to significantly reduce the fuel in the oil in my wife's DI Hyundai sonata hybrid.
Either that or change the oil only (not the filter) after driving 3,500mi of daily driving trips in the cold.

 

[GenSan]

On my 2024 Rav4 Prime PHEV fuel dilution was flagged by Oil Analyzers. I noticed especially in winter only an hour drive would keep the oil level where it was originally on oil change. Otherwise the level would slowly rise on daily checks and a few times even had a couple emulsified oil spots on the dip stick. Change your oil at 5,000 miles or less especially in the winter.

 

[Exhaustgases]

I'm thinking 2 to 3 hours of run time.

 

[Patman]

I'm thinking 2 to 3 hours of run time.

Honestly even that’s not going to do it. There have been members here who do long highway runs and still see fuel in their used oil analysis. I think that once fuel gets in the oil there really is no way of “burning it off “ completely. You need to drain the oil to get rid of it.

 

[WobblyElvis]

My wife drives her GDI car on short, 10 minute trips, a few times every week.
If I get the car up to operating temperature, even if for only 10 minutes, once a week I do not notice and increase in oil level.
I do not smell fuel on the dipstick either.

 

[dvancleve]

I should have added that the oil looks and small normal to me. I checked the oil level before the trip, after arriving in LA, and again at home. It was above the top dipstick mark, butince the oil hasn’t been changed yet, I wasn’t sure if it was gas raising the oil level or if it was just overfilled. After the round trip, the level looks the same to me and the oil seems the same as well. My current conclusion is that it’s just a bit overfilled. In my day to day use, the ICE very rarely turns on, so it wouldn’t affect the oil. It is almost always above 40F here even in winter, so I would think condensation should be minimal

 

[dvancleve]

I'll just say that 800 miles on a quarter tank of gas is freakin' impressive!

Just to clarify, that’s plugging it in most days and trying not to trigger the ICE. It’s fully EV capable, but if you floor it, it does turn on the engine, so I try not to do that…

 

[dvancleve]

I should have added that the oil looks and smells normal to me. I checked the oil level before the trip, after arriving in LA, and again at home. It was above the top dipstick mark, but since the oil hasn’t been changed yet, I wasn’t sure if it was gas raising the oil level or if it was just overfilled. After the round trip, the level looks the same to me and the oil seems the same as well. My current conclusion is that it’s just a bit overfilled. In my day to day use, the ICE very rarely turns on, so it wouldn’t affect the oil. It is almost always above 40F here even in winter, so I would think condensation should be minimal

Typos that I missed corrected