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Oil in air filter

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On the ASET AC engines the air compressor gets is fresh air from the air filter piping going to the turbo. When the engine is run with a dirty air filter the suction from the turbo is so great tgAt it sucks oil up past the air compressor piston rings and the oil settles in the air filter piping and mouth of the turbo intake . Usually it’s a thick tar like residue. Kinda normal actually. Mack had a couple of bulletins on it but I dont know if it helped any. 

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