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i actually put this to the test after pulling out some very dark sludgy looking oil out of my hp oil res once, after reading that it circulates. I put some uv dye directly into the oil fill tube let the truck run a bit then stuck a small screwdriver into the hp oil rez to find that there was UV dye present. So it definately does cycle so I cant explain why it looked so awful when I had recently changed my oil. But yeah its mostly up to you.
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2001 PSD 7.3 auto DP Tuner, 4" TBE, KNN Intake (with filter charger), CCV Mod, DB Starter, Stancore GPR, ITP Overboost, John Wood installed valve body. External coolant filter. International Up Pipes.
1994 RAM 4x4 Cummins KNN, 3GSK, AFC Spring, #10 Plate, BD Valve Body, KDP, SCHWITZER S300 turbo 4" TBE.
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