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Why is there gas in my oil

I have a 2002 tahoe I took In for an oil change about a week after I got it, when I was at the counter paying the mechanic that changed came up and told me that I had fuel In my oil, he didn’t say how much exactly just that he could smell it pretty good, how did it get there and will it ruin my engine?

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Have someone look into your fuel injector and fuel pressure regulator (and related systems).

Yes, a lot of gasoline in the motor oil is bad because it reduces the oil's ability to function as a lubricant. Lack of lubrication causes unnatural wear along the cylinder walls and bearing.

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