White smoke go out the exhaust. Burn oil smell detected. What are causing this trouble?
Posting the Sears 917.xxxxxx or engine brand, model type/spec could be useful.
Likely the carburetor needle& seat is leaking through and filling the crankcase with gasoline.
SMELL the oil for the presence of gas.
Else, possibly a blown head gasket.
Thank for answering, tracteur model 944.609260
The engine should be a-
They are somewhat susceptible to blow head gaskets, but CHECK the OIL first for the presence of gasoline.
It will be a STRONG smell.
Don't run the engine until this is resolved, since the "thinned out" oil has VERY POOR lubricating abilities.