Gas in my oil

Hello I drive an automatic 2006 Jeep commander with about 233,500 miles on it. I just recently bought the car and I just did an oil change on it and put in its 6 quarts that it needed, now a week later the oil level has risen and it has a gassy smell on the dipstick. What could cause this to happen?

(when I did the oil change there was also gas in the oil pan)

Excess fuelling (faulty injector/carburretor) and/or excess blowby. possibly caused by bore wear or stuck piston rings.



Thats quite a high mileage


I dont have any experience with modern (OBD2 etc) cars but understand they should report fuel trim data to tell you if they are running rich, and/or you can get an emission test done.



Compression or leakdown test will tell you if excessive blowby is likely.


If you've got excessive blowby that's likely to require an engine strip, though unclogging rings (brake fluid or other solvent soak) and a catch can might help a bit