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Is fuel in your oil normal?

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Old Mar 24, 2005 | 10:08 AM
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SpeedracerRX7's Avatar
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Is fuel in your oil normal?

It is something that I have noticed for a while but it is especially noticeable when you change the oil. It reaks of fuel and I was wondering how normal this was? I know fuel is a detergent and probably doesn't hurt anything, but is it indicative of a problem?
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Old Mar 24, 2005 | 10:17 AM
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Here's an older post:

Originally posted by turbojeff
I bought my 93 R1 with 36K miles. Oil has always smelled like gas. I doubt the motor was worn out with only 36K. I've sent 4 different samples to Southwest Spectro Chemical for analysis, 10% fuel dilution everytime.

I change the oil every 1500-2000 miles with 20W-50, the car has 62K miles on it now.

All the other FDs and TIIs I've owned also had this smell. It seems completely normal.
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Old Mar 24, 2005 | 10:18 AM
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It's official! 1000 threads on fuel smell in oil!!!


And for something completely different....You quicksilver_rx7's friend?


Shawn

Last edited by shawnk; Mar 24, 2005 at 10:32 AM.
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Old Mar 25, 2005 | 08:27 AM
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I'd say it's common, but not normal.
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Old Mar 25, 2005 | 12:59 PM
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I've had the gas smell in my oil since the car was new in 1992.
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Old Mar 25, 2005 | 02:05 PM
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i thought fuel broke down the oil and made it thinner as well. maybe i have been wrong
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Old Mar 25, 2005 | 02:36 PM
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I have had this since I got my FD as well. I always thought it may have something to do with my tuning being on the rich side. I just change my oil every 1200-1500mi because it does thin out the oil a bit...
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Old Mar 25, 2005 | 02:45 PM
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From: Mechanicville, NY
During combustion and what not I think some of the fuel gets pushed past the seals into the oiled areas, hence the oil smell.
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Old Mar 25, 2005 | 02:48 PM
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Originally Posted by KevinW
i thought fuel broke down the oil and made it thinner as well. maybe i have been wrong

It's does. Fuel doesn't lubricate as well as oil. They aren't saying it's good, but that's is normal for most rotaries (hence why we change our oil more than most other cars).
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