Oil and filter change

JOE1953

MEMBER
2004 GMC ENVOY
4.2L
V6
FWD
AUTOMATIC
180,000 MILES

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?

Wednesday, March 16th, 2016 AT 9:32 AM

3 Replies

HMAC300

MECHANIC
48,601 POSTS

The useful life of oil.

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Wednesday, March 16th, 2016 AT 9:35 AM

JOE1953

MEMBER
619 POSTS

I do not understand what you mean about Useful life of oil?

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Wednesday, March 16th, 2016 AT 5:52 PM

CARADIODOC

MECHANIC
33,752 POSTS

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.

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Wednesday, March 16th, 2016 AT 6:26 PM