Oil Change
20,000 miles on H3 and I just changed over to Royal Purple motor oil. OnStar sends out information once a month. Question is; how can I check to see just how much life is left on oil? I do not like the idea of changing out when I have 50% - 60% or more life left. I have been changing out every 3,000 miles. 
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2006 Slate Blue Metallic H3, FlowMaster exhaust, True Flow cold air intake system, Ground Force rear lowering kit, custom locking fuel door, chrome hood grill w/handle, US Speedo gauge kit (chrome and red numbers), Custom rear tire cover, chrome tail light guard, custom paint on skid plate, new pin stripping, USMC front license plate.  Semper Fi
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