Oil and filter change

2004 GMC ENVOY
180,000 MILES • 4.2L • V6 • FWD • AUTOMATIC
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JOE1953
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Before I changed the oil and filter on the dash it show 0/%, but after I change the oil and filter it show 100%, but I just added 6 quart so what does 0% and 100% mean?
Mar 16, 2016 at 9:32 AM
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HMAC300
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The useful life of oil.
Mar 16, 2016 at 9:35 AM
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JOE1953
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I do not understand what you mean about Useful life of oil?
Mar 16, 2016 at 5:52 PM
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CARADIODOC
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  • ASE Certified Mechanic
The additives in the oil wear out based on mileage, time, and temperature. Oil is oil and that does not change. We change oil because it becomes loaded with contaminants and the additives wear out. Your display is implying some computer knows better than you when that occurs and oil should be changed. In reality, most computers simply go by mileage. If you change your oil every 3,000 to 4,000 miles, you should be fine unless the manufacturer of the truck or the manufacturer of the oil have something different to say.
Mar 16, 2016 at 6:26 PM
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