For me it was a bad cartridge seal. Excessive oil in the intake + compression in the crankcase. I pulled the turbo and leak tested it with water. The water freely flowed through the seal to the oil passage. $150 part
I just picked up another 40lb's of sand from Barstow Friday. I started with my shop vac followed by four sessions with the pressure washer. I am doing open heart surgery tomorrow to find out what's making my turbo sick. Then off to the machine shop!
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