Not necessarily. If the oil filler cap wasn't on tight it could have just vibrated off. If the cap is not on the filler tube it will blow oil out of the tube with a good running engine. I would refill the oil, tighten the cap, clean up the oil spill and try the mower again to see what happens. Chances are everything will be fine.
likely a bad engine.
If you mess with the governor you will probably blow the engine up. Change sprocket ratios or replace the engine with a bigger one.
Worn piston rings. Incorrect weight engine oil. Gasoline mixed with engine oil. Crankcase overfilled with engine oil.
The most common reason for a riding mower engine to run hot is that the cooling area under the metal tins around the engine is probably full of grass clippings or mouse nesting. You will need to remove the metal covering the engine and clean it out. The flywheel has fins on it the blow air accross the engine to keep it cool.
How do you blow a engine turbo.
governor near air filter... don't adjust it too much or it will eventually blow the engine.. youtube has instructuions on how to properly adjust the spring
Set your mower on level ground and wait for 10 minutes or so to let all the oil drain into the crank case, then check the oil level. It sounds like there is too much oil in the engine.
Too much oil in it, have you hit somthing lately with mower ? timing could be off, rings leaking thru, [blow back] age of engine !
wrong filter with wrong thread pattern.
There are several ways to blow up a cars engine. If your car loses all its oil and you don't shut off the engine you could blow it. You could blow it by over revving the engine for long periods of time. If the engine doesn't have water in it it could run hot and quit.
Blow by is caused by internal engine problems. You need a new engine.
The engine blow by is exhaust gasses trough out the breather pipe