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if leak down is 0...
The leakdown checks the rings and valve seal (valve to head - not valve stem sealing) - if 0 or low then either they are not leaking or your tester isn't working correctly - you should see a small amount of leak...
with 198 pressure I'd suspect the rings and valve sealing are good
so where does the fouling come from??? a few ideas/questions
valve seals and valve stem wear/condition - it could be a seal is worn or popped off and hence more oil is flowing down the valve
How many miles on the car?
What type/weight of oil are you using?
does it smoke when it runs?
does that cylinder have spark?
Have you replaced that plug?
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