Blow by hasnt changed much if any (I have been keeping a eye on it). If im nice to it the gauge never moves but i can empty 1/4 tank in two days and i only drive 15 miles each way if i beat on it. Open exhaust always sounds strong

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1996 s10 zr2 with a 6.5 turbo diesel
1996 c2500 suburban with a 6.5 turbo diesel
1981 300sd with a turbo 617
Monte carlo figure 8 car