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2003 gmc envoy_slt
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The owners manual says 100,000 miles.
 

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2004 chevy trailblazer_lt
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417 Posts
Discussion Starter · #3 ·
would you suggest doing it a lil before then? i have 81k on it now.
 

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2003 gmc envoy_slt
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7,190 Posts
Honestly, yes. But I have a hard time getting past my roots, which was changing plugs and points twice a year.:duh: If your truck is running good and the mileage hasn't dropped any, there really isn't any reason to change before the 100k and even then. Unless you have the time, money, and just want to be pro-active about maintenance.
 
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