well if he has oil coming out of his exhaust then his turbo is definitely blown up, center cartridge seal must be destroyed and the turbo prolly isnt making very much boost if the bov isnt responding, or its just clogged with oil, cause if the center cartridge seal is leaking, then it can get into either the turbine or compressor side and go into the motor or the exhaust........HATING IT........sometimes im so glad i got rid of my turbo kit, but most of the time i miss it........