Re: Briggs & Stratton 12.5 hp - Gas getting into oil
Like Bill said, plus I would install an inline fuel shut off valve and use it every time the engine is stopped for more than a few seconds, never know when a speck of something is going to lodge under the float needle.
The EPA in its' wisdom, mandated that mfgs. due away with the "weep" hole in the carb air intake of old. When the float needle leaked on these, it dripped out on the ground/floor, you saw it, smelled it, and did something about it. Now it leaks into the cylinder and on down into the oil and ruins the engine unless you catch it. ALWAYS check the oil level before using the engine and high level must be checked out perhaps even more than low oil level.
NO, there is not anything else wrong with your engine.