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I have about 92k on my truck. Should I replace my plugs? With what kind? What else needs replacing?
 

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2004 gmc envoy_slt
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Usually at 100K plugs are changed, front and rear differential fluids are changed, every 50K miles the transfer case fluid is changed with GM AutoTrac II fluid. Probably drain and flush engine coolant, bleed brakes, replace downstream (on exhaust manifold) O2 sensor.
 
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