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This is an '07 Chevrolet Silverado 2500HD LBZ Duramax. The truck had 175,000 miles on it at the time of this OCI/UOA (182k or so now), running Shell Rotella T6 5W-40 since about 45,000 and using a Fram PH9100 filter (no bypass or extra filtration). The engine operates daily on a +160 tuner, as...