I have gas in oil. Whats the problem ?

Take coil off clean.also remove spark plugs replace or clean and gap.question were you in a lot of water:)

02 sensors.

CHECK GAS FOR WATER THEN CHECK MAKE SURE GETTING GAS CHECK PLUG WHAT DO THEY LOOK LIKE WHEN CUTS OFF DOES IT LOOSE SPARK REPLACE COIL IF DOES 80.00 IF NOT GETTING GAS REBUILD CARB ALSO CHECK FUEL FILTER BAD THING ABOUT TRACTORS IF YOU LEAVE THEM OUT SIDE UNCOVERED THEY WILL GET WATER IN GAS ALL OF THEM SO DRAIN GAS OUT PUT IN NEW ALSO DRAIN CARB OUT ALSO CHECK OIL LEVEL IT HAS A OIL CENSOR ON IT THAT REEDS OIL LEVEL IF OIL LEVEL NOT SAFE THEN WILL SHUT IT OFF TRY THIS LET ME NO WHATS HAPPENS THE RED NECK

Sounds like a cracked cylinder head...

if this is the issue, suspect your fuel pump diafram is perished
also check if fuel is getting into your engine oil, check the dipstick and see
if the oil level is hight or its thin and runny oil smelling of gas,

if this is the case, recommend changing the fuel pump and changing the oil, in that order.

I hope this was useful.

Gas in oil usually gets there in a 4 stroke engine in one of 2 ways- through the induction system from a defective valve in the carburator, or a ruptured diaphragm on a fuel pump that is attached to the crankcase. If the carburetor has a float bowl, the float may be faulty, the needle and seat may be faulty or dirty, otherwise the diaphragm types can have either or both types of valving to control fuel flow into the engine.

give me more info about your plug, is it black by oil or black powder from gas ?
in the other hand, smoke white is a motor cold on winter, smoke blue is oil inside motor, smoke black is gas not burned,
so be shure exactly what color is...

Check this.
As the engine begins to stall, loosen the gas cap.
If the engine continues to run, clear the vent holes in the gas cap.
Gary

*Oil change.
*Accurate tire pressure. (highway drivers experience better MPG with tire pressure 2-3 pounds higher than whats called for on tires)
*Tune up/spark plugs
*Injectors clearer/replacement. STP injector cleaner
Bad fuel/low grade/gas supplier might be bad. Try new gas station

only other thing i can think of is has the air to petrol screw been moved