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What are the symptoms of gas in engine oil?

I was given my great-grandfather’s 1999 F-150 when he passed away. It’s got a lot of miles on it, and has some issues, but I plan to keep it for sentimental reasons. The problem is, when I checked the oil the other day, I got a heavy whiff of gasoline on the dipstick. What are the symptoms of gas in engine oil?

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Rachel Rigolino · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
Being given a well-loved vehicle by a family member is like inheriting a family heirloom—and you likely want to take care of that truck the best you can. Here are some symptoms of gas in engine oil:
  • Gas smell. This is what you reported when you checked the oil.
  • Low oil pressure. The next time you start the truck, check the oil pressure gauge to see if your pressure is low.
  • Smoke from exhaust pipe. White or black smoke can be one of the symptoms of gas in engine oil.
The gas smell can indicate a problem, from a bad sensor to bad piston rings, and the cause should be diagnosed as soon as possible, so don’t ignore the issue.
Hopefully, a visit to your mechanic can quickly resolve the problem, and you can continue to drive around in your great-grandfather’s gift to you.
The symptoms of gas in engine oil can indicate a wide variety of problems, some more serious than others. Taking the time to do your research and bring your vehicle in for maintenance can save costly bills in the future.
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