Spark oil residue probably caused by worn piston rings and valve guides. You can try replacing the spark plug for a hotter to try to reduce oil residue is deposited on the plug, but probably due to replacement of the Rings. 
The excessive heat has echo that asylum is completely white with no deposits of any kind and the electrodes are too eroded. The causes can be various, little water in the cooling system too lean, driving the car at high speeds often ignition timing advance, etc. 
central electrode melted, may miss the ground electrode or the insulator is damaged due to pre-ignition is occurring in the combustion chamber. You should check if the plug is in the proper heat range for the engine operation. You may also be due to the mix is \u200b\u200bnot correct, or accumulation of particles within the combustion chamber. 
The light brownish deposits stuck to the ground or center electrode. can be caused by the used oil and some fuel additive.
produces a power failure since the remains are not drivers.
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