Gas in oil

Asked by Mar 27, 2018 at 06:04 PM about the 1997 Chevrolet Cavalier

Question type: Maintenance & Repair

My car recently over heated so we put in a new
radiator and water pump then it over heated again
and turns out it was the thermostat. Now it won’t
turn over at all and there’s gas in my oil. What do I

13 Answers


Replace the coolant temperature sensor.

Would that be a code? I’ve checked the codes and I don’t have any.


Yes it would set the light.the issue has not been picked up yet.


Are you saying the engine is locked up or battery or starter has died or it is turning the engine over just cranking up and running?


It may be anti-freeze in you oil since the over-heating can lead to or be because of a blown head gasket.

It’s just cranking. It sounds like it’s about to start but just goes back to cranking

I was told it could be a crack in the engine or a blown head gasket


Since it is cranking over the injectors are pumping fuel, but I would do a compression test on those cylinders as if the head gasket is blown they or most of the cylinders will be very low compression.


I am sure that since its not starting up the plugs are fouling, with either and/or fuel/water.


More likely a blown head gasket than crack. Is your oil milky yet.

No it looks normal just smells like it had gas in it


You may be ahead of a gasket failure, either let it sit a while to let the spark plugs dry off or pull them each to spray them off with carb cleaner then re-install and see if fires up if it does be sure to bleed all the air out of the system and when it warms up see if your radiator fan comes on.


If it cranks and you do the above and gas has thinned the oil or it is dark looking, go ahead and do a oil change, if filter is old change it too if its been awhile since filter was changed. Watch to see if the fans come on when up to temp, Watch to see if temp gauge goes up and turn engine off before it hits the upper red (hot) of the gauge and also see if gauge goes up and down but not all the way to hot or falls from hot then returns to hot, if so you either still have air bubble in the cooling system or head gasket is starting to fail followed by steam exiting the tail pipe (exhaust).

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