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This is the introduction manual of how to mileage corretion on Buick GL8 via OBD

Here you go...

Purpose: OBD odometer correction for a Buick GL8 car

Tool used: Obdstar X300 DP 

The dashboard shows the mileage: 447183

Go to Diag Program

Mileage adjustment-> GM

Obdstar x300 dp tablet GM V30.50 (newest)

Select the model: GM->Buick->GL8->Old GL8

Current mileage value: 447226km

Input the mileage of adjustment; here: 445000

comfirm

The new mileage value: 445166km

The dashboard displays the new mileage: 445156

OBD change mileage successfully!

Source:http://www.mileageprogrammer.com/x300-dp-adjustment-ok-on-buick-gl8/