I dont know what the name is... never used it . I do know it is so they can tell if you messed with it to limit warranty claims from failed oil changes causing failed engines.

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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